- Police formally identify attacker as Kent-born Khalid Masood, 52
- Fourth victim, a 75-year-old man, dies of injuries in hospital
- Islamic State claims Westminster attacker was one of its 'soldiers'
- PM reveals he was investigated by MI5 over 'violent extremism'
- Eight arrested as police raid six addresses across UK over attack
- Pc, American tourist and British mother among the dead
- Crowds gather in Trafalgar Square for vigil to remember victims
- Sir Michael Fallon's bodyguard was officer who shot terrorist
- Reconstruction: The day terror struck at heart of democracy
After Isil claimed the attacker was a "soldier" of the terror group, Scotland Yard formally identified the 52-year-old - saying he was not the subject of any current investigations and there was "no prior intelligence about his intent to mount a terrorist attack".
But the man who killed four people - including a police officer - in the shadow of the Houses of Parliament had a range of previous convictions for assaults, including GBH, possession of offensive weapons and public order offences. He had not been convicted of any terrorism offences.
It comes as police said a fourth innocent victim died on Thursday night. The 75-year-old man died from his injuries in hospital.
A Scotland Yard spokesman said: "The man had been receiving medical treatment in hospital following the attack and life support was withdrawn this evening.
"Next of kin have been informed and are receiving support from specially trained family liaison officers."
But by the time Masood went on the rampage on Wednesday, driving a car at 50 miles an hour along Westminster bridge, murdering three innocent pedestrians before plunging his knife repeatedly into a police officer guarding the Houses of Parliament, he had dropped off their radar.
Masood, a father of three, was no longer considered a threat. The Telegraph can disclose that Masood was not using his birth name. He was born Adrian Elms in Dartford, Kent.
Just two hours after Theresa May told the Commons the killer was a British citizen who had been investigated by MI5 over violent extremism, Isil said that the attacker answered "calls to target citizens of coalition nations". Isil had vowed that the UK was its next target following the Paris attacks in 2015.
The Prime Minister earlier said the attacker was known to the police and security services, as she defiantly vowed: "We are not afraid and our resolve will never waiver in the face of terrorism."
It comes as Scotland Yard disclosed that the eight people - three women and five men - arrested in London and Birmingham are being held on suspicion of preparation of terrorist acts.
Detectives are continuing to search a number of addresses linked to the investigation: one in Carmarthenshire, three in Birmingham; and one in east London.
Three of the victims were named as Pc Keith Palmer, who the suspect stabbed; Aysha Frade, a British mother of two, and American tourist Kurt Cochran - both of whom where mown down as the terrorist sped across Westminster Bridge in his car.
A total of 29 people were treated in hospital following the carnage, with five people remaining in a critical condition on Thursday evening - two of them with life-threatening injuries.
Among the injured were 12 Britons, including three police officers who were returning from an event to recognise their bravery.
Meanwhile, at the scene of one of the police raids - a flat in Hagley Road, Birmingham, where the attacker is believed to have lived - witnesses told how black-clad officers equipped with machine guns smashed their way into the property.
One neighbour told The Telegraph: "It's left me so scared and I don't know what to tell the children. He seemed like a normal calm and kind family man, always with a smile on his face."
The attacker mowed down pedestrians with a car on Westminster Bridge before crashing at the railings in front of Parliament.
Bursting through the gate to the Palace of Westminster, he stabbed Pc Palmer before being shot dead by a close protection officer, who The Telegraph understands is Defence Secretary Sir Michael Fallon's bodyguard.
A minute's silence was held in Westminster at 9.33am to pay respects to the victims, before a candlelit vigil will be held in Trafalgar Square on Thursday evening. Stay with us for the latest updates throughout the day.
Masood 'spent time in Saudi Arabia'
The Sun has reported that Masood visited Saudi Arabia in 2005. According to a CV that the newspaper claims it obtained, he was working in Yanbu, Saudi Arabia, then teaching workers at the General Authority of Civil Aviation (GACA) in Jeddah.
If confirmed, it would raise questions as to whether he was radicalised before or during his time abroad. The Telegraph has reported he is understood to have gone to jail in the past, where there is a good chance he was radicalised. It is at that stage, it is thought, he came onto MI5’s radar.
'All day, I couldn't get it out of my head'
A British boxing team have recalled the horror of witnessing Pc Keith Palmer being stabbed as they secured victories in the ring a day after the attack.
Coach Tony Davis was outside the Houses of Parliament after attending a community event with the British Lionhearts team when terror unfolded in front of him.
The four fighters at his side spoke of their trauma after seeing the hopeless efforts to revive the officer.
Flyweight and 2016 Olympian Muhammad Ali, who won his fight by unanimous decision on Thursday night, said: "All day, I couldn't get it out of my head because we saw everything."
Fellow member of the British Lionhearts, welterweight Pat McCormack, added: "I didn't really sleep much. My head was a bit all over and I couldn't really stop thinking about it but I'm just glad I've come, got the job done and the win."
Davis told Press Association Sport:
"We had just attended a PR event at the Houses of Parliament and as we were leaving we could just see straight in front of us, on the outside of the perimeter fence, a bit of a fracas.
"It was loud volume, but I didn't think much of it. I thought it must be a student demonstration but then the mood changed as I saw someone come through the gate with knives above his head and start attacking the police officers.
"When I saw that I jumped over what was maybe a 4ft fence to try to give assistance but a lot of things happened in a few seconds.
"As the assailant was advancing he got taken out by one of the police marksmen. Then I just tended to Keith Palmer, who was collapsing on the floor."
'His face would change in a moment' when he talked about religion
Neighbours of Masood have told how he had a “split personality” and that he would change instantly when talking about religion.
Anna Goras, 32, told The Sun: “His face would change in a moment and his eyes would go hard and look evil.
“He often went off about how British people didn’t bring up their kids right and sent them to poor standard schools."
Masood reportedly said 'London isn’t what it used to be' on morning of attack.
The suspect told staff at a budget hotel in Brighton where he is thought to have spent his last night that "London isn’t what it used to be," The Sun reports.
Khalid Masood was born Adrian Elms in Dartford, Kent
Robert Mendick writes:
As long as a decade ago, Khalid Masood’s “violent extremism” had caused security services sufficient alarm to put him under investigation.
But by the time Masood, 52, went on the rampage on Wednesday, driving a car at 50 miles an hour along Westminster bridge, murdering three innocent pedestrians before plunging his knife repeatedly into a police officer guarding the Houses of Parliament, he had dropped off their radar.
Masood, a father of three, was no longer considered a threat. The Telegraph can disclose that Masood was not using his birth name. He was born Adrian Elms in Dartford, Kent.
US source says London attacker associated with those interested in jihadist groups
Masood had been "hanging out" with would-be jihadis who wanted to travel to fight abroad, a US government source told Reuters.
There was no indication Masood had himself gone abroad to fight but people he associated with had wanted to.
"The people he was hanging out with did include people suspected of having an interest in travelling to join jihadi groups overseas but the attacker himself never did so," the source said.
75-year-old victim had been treated at King's College Hospital
The 75-year-old man who has died tonight as a result of the attack was being treated at King's College Hospital, a spokesman has said.
The decision was taken tonight to withdraw his life support.
Britain's terror hotspots
Raids took place today in Birmingham, Luton and East London.
Our Deputy Political Editor Steven Swinford outlines the areas' previous links with extremism here.
Police search attacker's former partner's home
Records suggest that Masood was married to a 39-year-old woman named Rohey Hydara.
Police confirmed that a 39-year-old woman held in east London was among the eight people arrested.
Police were tonight searching a flat believed to be her home, a newly built property in the heart of the Queen Elizabeth Olympic Park in Stratford, east London.
Residents of the nine-storey block near to the Eurostar Stratford International Station said police had been in the building all day.
A neighbour at an address Ms Hydara is believed to have previously lived at in Forest Gate said three children lived in the home with their mother, aged between eight and 15.
He said they moved out in the last two years to the Olympic Village.
75-year-old man dies in hospital after attack
Police have said another victim of the attack has died tonight.
In a statement the Metropolitan Police said: "Detectives investigating the terrorist attack in Westminster on Wednesday, 22 March can confirm that a 75-year-old man died tonight, Thursday, 23 March.
"The man had been receiving medical treatment in hospital following the attack and life support was withdrawn this evening.
"Next of kin have been informed and are receiving support from specially trained family liaison officers."
'A true Muslim would never do this' says worshipper at East London mosque
Worshippers at the Al-Tawhid mosque in Leyton were surprised to learn of Masood's alleged links with the mosque, Rozina Sabur reports.
One, Abdul Abdul, told the Telegraph: "We condemn this attack. A true Muslim would never do this. He's not one of us, he's not a representative of us".
Peace vigil to be held in Birmingham
A peace vigil is to be held in Birmingham on Friday to promote unity, after the city's most prominent mosque issued a statement condemning the Westminster terror attack as "barbaric and heartless".
The city centre vigil has been organised by the Stand Up To Racism group and MEND (Muslim Engagement and Development) and will begin at 5pm in High Street.
Officials at Birmingham Central Mosque Trust recently published a 12-page booklet entitled Terrorism is not Islam, endorsed by West Midlands Police and 29 other major mosques in the city.
Birmingham central mosque chairman denounced terrorism, said they don't know who terrorist is & gave me leaflet on "Terrorism Is Not Islam" pic.twitter.com/1GUhaj82Ba— Helen Pidd (@helenpidd) March 23, 2017
In a statement, mosque chairman Muhammad Afzal said of Wednesday's atrocity in London: "Nothing justifies taking lives of innocent people.
"Those responsible must be brought to justice to protect good, in our constant fight to eradicate evil within humanity."
Last night Birmingham Library was lit up in the colours of the Union Flag.
Urging calm within all communities and offering condolences to those bereaved by the attack, Mr Afzal added: "The Islamic faith does not allow anyone to take the life of others.
"No religion justifies the indiscriminate killing of individuals in such a barbaric and heartless way, and such acts only serve to differentiate between the misguided and the just.
"We call upon those that may have even a shred of sympathy for the like-minded terrorists to shake their conscience and realise that such acts are the work of evil and not the work of God-fearing people."
In a statement on Facebook, the organisers of the vigil wrote: "Our thoughts are with all those affected by what has happened.
"Birmingham is a united city and we will not let anyone use these terrible events to divide us. Please come and join us on Friday for a unity vigil."
'Teacher' Masood had never worked in English state schools
According to reports Masood had previously worked as an English teacher.
However, it is understood he never worked as a teacher in any of England's state schools.
Controlled explosion near Downing Street
A controlled explosion on a suspicious package is believed to have taken place near Downing Street tonight.
The BBC News Channel reported that a loud bang had been heard within earshot of their live broadcast. Officers said it had taken place on Birdcage Walk, not far from the Houses of Parliament and Downing Street.
The Metropolitan Police told the Telegraph that officers had found a suspicious package.
The spokesman said the force had been receiving a lot more phone calls since the attack as they have told the public to be vigilant.
However he said the package was not believed to be anything out of the ordinary and such incidents are routine for officers.
Unattended bag found Birdcage Walk/Horseguards was not suspicious. All cordons put in for safety being lifted. Thanks for your patience.— Westminster Police (@MPSWestminster) March 23, 2017
Khalid Masood 'not the attacker's birth name'
Police said earlier that the attacker went by a number of aliases.
Scotland Yard now say that they believe Khalid Masood was not his birth name.
A spokesman for the force said research into Masood's aliases was ongoing, adding: "Khalid Masood is not at this early stage believed to be his birth name."
Minute's silence held around the world for London attack victims
In pictures and video: tonight's vigil at Trafalgar Square
The message from Londoners in Trafalgar Square tonight is clear, writes Eleanor Steafel: "We are not afraid".
After Wednesday's events, there was a determination throughout the city to carry on in the face of it all. The mood at Trafalgar Square was sombre but defiant, as people of all ages and backgrounds stood together, many of them Muslims holding up signs saying: "Love for all, hatred for none".
Among those who came to pay their respects was Jess Okpere, whose teacher Aysha Frade lost her life on Westminster bridge.
Carrying a bunch of daffodils and clearly very emotional, the 18-year-old said: "I cried this morning when I found out. I've had a very long day filled with a lot of tears. I'm here to show that we're not going to let these people win."
Standing on the steps in front of the National Portrait Gallery, faith leaders joined Home Secretary Amber Rudd, Acting Met Commissioner Craig Mackey and Mayor of London Sadiq Khan. Three large candles in glass hurricane lanterns sat before them.
The respectful hush in the square was broken only by applause, as the Home Secretary praised PC Keith Palmer.
"He was courageous, he was brave and he was also doing his duty," she said. "It reminded us of how we are all connected."
In an impassioned address, Ms Rudd said: "The terrorists will not defeat us, we will defeat them."
Sadiq Khan spoke of how Londoners had come together in the aftermath of the attack.
He said: "London is a great city full of amazing people from all backgrounds, and when Londoners face adversity, we always pull together.
"Our response to this attack on our city, on our way of life, our shared values, shows the world what it means to be a Londoner."
The crowd fell quiet as a minute's silence was observed in honour of the victims. Many bowed their heads, while others clung to each other for comfort.
As the silence lifted, people began lighting candles and placing them in boxes filled with sand. Soon, the faces of people all over the square were lit with candlelight.
Amanda Goodhugh, who works at St Thomas's Hospital, where two of the victims were taken on Wednesday, sat on the edge of one of the fountains and cried, her face in her hands.
She told the Telegraph she had been overcome with emotion watching people come together in solidarity. "People's positive response is what is making me so emotional," she said.
"That, and the staff at my hospital who ran out into the road yesterday to help. That is what healthcare in this country is all about."
Generous response to appeal for donations to policeman's family
A JustGiving page is raising money for Pc Keith Palmer's family after he was killed in the attack.
It has now reached over £275,000.
Attacker was a 'polite' and 'shy' man, former neighbour says
Katie Garriques, 48, a former headteacher who has lived across the road from Masood's former address in Luton since 2001, has spoken to our reporter Harry Yorke.
He was "polite, shy" and a "quite portly man" who she often saw gardening at the front of the property and playing with his children.
She added that he often wore Islamic dress at the weekend and a pair moccasins.
"There was family there. He was a quite portly man, beard and he had two or three children, I can't quite remember.
"They were under six at the time."
Mrs Garriques added that Masood lived at the property sometime between 2010 and 2011.
"I've been here since 2001. It used to be a nice secular close, but as time went on it became more buy to let.
"As soon as I heard the name I thought oh my god.
"I recognise the name, the beard and I remember he had children.
"He was often gardening, mowing the lawn. I think he had the windows changed in the property.
"He was frequently out with his children in the morning and in the afternoon.
"He had at least two. A younger one, and he had a people carrier. He was always polite.
"I'm just saddened. I feel sick to be honest."
Mrs Garriques has also been speaking to Sky News. She said Masood was houseproud and seemed to be a good househusband.
Monica, another neighbour who lives opposite Masood's former address, said she would only ever see him at night.
"He was like a shadow, you wouldn't often see him.
"He was often dress in Islamic dress, black clothes with a hat.
"He was always wearing a hat. Always black clothes, long ones."
#WeStandTogether Wembley arch lit up tonight
Security weaknesses at Westminster
MPs warned last month that security at Parliament's main gates was so weak it could put police officers at risk, our political team report.
Khalid Masood was able to run through Carriage Gates and into New Palace Yard where he stabbed PC Keith Palmer to death.
The Daily Telegraph understands that police have raised repeated concerns about the security of the gate, which has been described as a “weak point”.
In February the House of Commons administration comittee discussed the issue, with a particular focus on the “flimsy” and “Meccano” crowd-control barriers in front of the wrought-iron gates.
The barriers have to be manually opened by police on the pavement outside Parliament, which MPs said put them at risk. The MPs called for them to be replaced with a stronger, automated gate which police could operate remotely.
Candles lit in Trafalgar Square as prayers are said for Pc Keith Palmer
Our reporter Eleanor Steafel is at the vigil in Trafalgar Square.
People who have come to pay their respects at the Trafalgar Sq vigil light candles pic.twitter.com/r0xo9klHyt— Eleanor Steafel (@eleanorsteafel) March 23, 2017
Among those who have come to pay respects are British Muslims who want to show that terror has no place in Islam pic.twitter.com/ZMSwGcQvNB— Eleanor Steafel (@eleanorsteafel) March 23, 2017
Bursts of applause were the only sounds which interrupted the speeches there tonight.
Candles were lit and a mintue's silence was observed for the three innocent victims who died in the attack.
Meanwhile prayers were said in Parliament for Pc Keith Palmer just metres from the spot where he was stabbed to death.
Rev Rose Hudson-Wilkin, the chaplain to Commons Speaker John Bercow, condemned the "act of evil" but urged people to remember the "acts of goodness" demonstrated by people who tried to help those killed and injured in the attack.
In a moving service in the Chapel of Saint Mary Undercroft within the Palace of Westminster, the chaplain warned against the danger of thinking "an eye for an eye" and urged people to share memories of the "heroic contributions on that day when evil dared to show its face".
The ornate chapel, just off Westminster Hall, is a short distance away from New Palace Yard where Pc Palmer lost his life.
Brandenburg Gate in Berlin lit up in solidarity with London
The Brandenburg Gate is the latest landmark to be lit up with the Union Flag in solidarity with London.
It is only three months since an attacker drove a lorry into a Christmas market in Berlin, killing several people.
Other places worldwide have shown their thoughts are with the UK.
Jeremy Corbyn: We need to stand together against hatred
Armed police should be at 'sensitive sites'
Police should consider arming all officers guarding "sensitive sites" after the London terror attacks, according to a Tory MP, our deputy political editor Steven Swinford reports.
Theresa Villiers, the former Northern Ireland secretary, suggested the issue of whether police who patrol areas "known to be of interest to terrorists" should carry a weapon for personal protection should now be examined.
Theresa May said who carries arms remains an "operational matter" for the police.
Ms Villiers said: "As we reflect on what happened, is it time to consider whether the police who guard sensitive sites known to be of interest to terrorists like Parliament or like airports should routinely carry personal protection weapons, even when those officers are not part of the units formally tasked with armed response?"
Minute's silence at candlelit vigil
At the vigil in Trafalgar Square, the crowd fell quiet for a minute's silence in honour of the victims. Many bowed their heads and others clung to each other for comfort.
Craig Mackey, Amber Rudd and Sadiq Khan then lit three candles on the steps.
Sadiq Khan: Londoners will never be cowed by terrorism
Sadiq Khan has spoken at the vigil tonight.
Craig Mackey, Amber Rudd and Sadiq Khan light candles at vigil
People are beginning to light candles and lay flowers on the square.
We have full coverage of the vigil here.
IPCC to carry out investigation
As is routine after a police shooting, the Independent Police Complaints Commission will now investigate the incident. However, no police officers are under investigation.
Independent Police Complaints Commission deputy chair Sarah Green has issued a statement:
"The terrorist attack in Westminster on Wednesday was horrific and our thoughts are with all of those affected by it.
"The IPCC is responsible for investigations into fatal police shootings. Accordingly, after being notified by the Metropolitan Police Service of the fatal shooting of a man outside the Houses of Parliament, we have opened an independent investigation. It's important to stress that we are currently investigating the circumstances of the incident and no police officers are under investigation.
"The IPCC and the Metropolitan Police Service are following agreed working arrangements related to terrorist incidents, which are working well. I recognise that this is a very difficult time for the police service, following the tragic loss of Pc Keith Palmer and the injuries to other officers. We are giving this investigation the highest priority and we will conclude it as soon as possible."
Update from Scotland Yard on seven people arrested in connection with Westminster attack
Detectives are continuing to search a number of addresses linked to the investigation:
- One in Carmarthenshire
- Three in Birmingham
- One in east London
Searches at addresses in Brighton and south east London have concluded.
A 39-year-old woman [A] was arrested at an address in east London on suspicion of preparation of terrorist acts.
A 21-year-old woman [B] and a 23-year-old man [C] were arrested at an address in Birmingham.
A 26-year-old woman [D] and three men aged 28, 27 and 26 years old [E; F; G], were arrested at a separate address in Birmingham.
All six [B-G] were arrested on suspicion of preparation of terrorist acts.
All seven arrests [A-G] were made overnight.
A 58-year-old man [H] was also arrested this morning at a separate address in Birmingham on suspicion of preparation of terrorist acts.
[A] is being detained under PACE and [B-H] are being detained under TACT.
Pupil of terror victim: I'm here to show that we're not going to let these people win
A pupil of Westminster victim Aysha Frade, a Spanish teacher, who lost her life in the attack, has come to pay her respects in Trafalgar Square.
Carrying a bunch of daffodils, 18-year-old Jess Okpere told The Telegraph's Eleanor Steafel: "I cried this morning when I found out. My school paid tribute to her. There were so many people crying, people who saw her every day.
"I was in the McDonalds by the London Eye in my free period when it happened. I didn't see it happen but I saw the aftermath, the ambulances and the stretchers.
"I've had a very long day filled with a lot of tears. I'm here to show that we're not going to let these people win."
'I am a Muslim, ask me anything' - T-shirts in Trafalgar Square
As a crowd gathers at Trafalgar Square, a handful of people are wearing t shirts with the words: "I am a Muslim, ask me anything" printed on them. Three members of the group are holding up a banner which reads: "Love for all, hatred for none".
Video: Faith leaders unite in solidarity over Westminster terror attack
#WeStandTogether: Crowds gather in Trafalgar Square for candlelit vigil
A crowd is beginning to gather at Trafalgar Square, where from 6pm Londoners will hold a vigil in honour of the four innocent people who lost their lives, Eleanor Steafel reports.
Speaking ahead of the vigil, London Mayor Sadiq Khan said this morning: "Tonight in Trafalgar Square there will be a vigil for Londoners who are wondering what to do.
"To show solidarity with those who have lost their lives and their families, to show solidarity with those who have been injured, and to say to the terrorists: 'You will not succeed in cowering us, we will remain united, and we are the greatest city in the world'."
"We are not afraid" and other messages of solidarity chalked onto Trafalgar Square pic.twitter.com/lEaKka0O8u— Adam Payne (@adampayne26) March 23, 2017
Michael Deacon's Commons sketch: Tributes, tears – and then steely resolve: how Parliament got back to business
They carried on. A wide area around the Palace of Westminster had been cordoned off, the Tube station was shut, and most entrances to the estate were closed. Yet this morning, refusing to be cowed, Parliament went back to work.
Read his full piece here.
Masood neighbour: 'It's left me so scared... he seemed like a normal calm and kind family man'
Patrick Sawer reports from Birmingham:
A mother of three was left stunned after recognising Khalid Masood, the terrorist pictured on a stretcher after Wednesday's attack, as the man who had lived next to her for several months.
Iwona Romek said she had been left terrified by the realisation she might have been living next to a fanatical terrorist who she had previously regarded as a "calm family man". She told The Telegraph:
"I'm so scared for my children knowing that he lived so near to us. We've lived here for 12 months and I never could have imagined that we were living next to someone who would do something so terrible.
"It's left me so scared and I don't know what to tell the children."
Mrs Romek, a cake factory worker from Poland who has lived in Birmingham since 2005, said the man - who she said looked in his late 40s - had lived at No. 4 Quayside, in the Winston Green district, for around seven months, before leaving suddenly about two months ago.
He lived with a woman of Asian appearance in her 30s who covered her hair with the hijab when outdoors, and their five year old child.
"I used to see them taking the child to school in their car. The man would smile but we never spoke," said Mrs Romek, whose children are aged 25, 15 and eight. "He seemed like a normal calm and kind family man, always with a smile on his face."
Theresa May visits Westminster terror victims in hospital
Downing Street has revealed that Prime Minister Theresa May has visited victims of the Westminster terror attack in hospital.
Following her statement to the House of Commons, the Prime Minister managed to get away from Westminster to spend around 40 minutes speaking with victims about their experiences.
She also spoke to medical staff to thank them for their work, said her official spokesman, who declined to name the hospital where the private visit took place.
Many of those injured on Westminster Bridge were taken to St Thomas' Hospital, which faces the Palace of Westminster across the Thames. Others went to King's College Hospital and the Royal London Hospital.
Mrs May also signed a book of condolence for victims of the attack in the House of Commons.
Pc Keith Palmer's family: He was proud to be a police officer, brave and courageous
The family of Pc Keith Palmer, the officer killed in the Westminster attack, have described him as a "wonderful dad and husband, a loving son, brother and uncle", adding that he was "dedicated to his job and proud to be a police officer, brave and courageous". They said:
"Keith will be remembered as a wonderful dad and husband. A loving son, brother and uncle. A long-time supporter of Charlton FC.
"Dedicated to his job and proud to be a police officer, brave and courageous. A friend to everyone who knew him.
"He will be deeply missed. We love him so much. His friends and family are shocked and devastated by his loss and ask that they are left to grieve alone in peace."
Italian woman mown down by terrorist on Westminster Bridge has surgery to her leg
An Italian woman who was injured in the Westminster terrorist attack has had surgery to her left leg, reports Nick Squires in Rome.
She is expected to be released from Chelsea and Westminster Hospital in a few days.
The woman, who was visiting London with a tourist group, was hit by the car driven by the attacker as he mowed down pedestrians on Westminster Bridge.
Italy's ambassador to London, Pasquale Terracciano, visited the middle-aged woman from Rome in hospital.
A spokesman for the Italian embassy said: "The ambassador was visiting for almost an hour visiting one of the victims, who is Italian. He brought flowers and gave her comfort.
"She was one of the people hit by the car. She is not in any serious danger of her life. She was just walking when it happened and had to undergo minor surgery to her left leg. She is expected to be released in the next few days."
Full statement from Scotland Yard on identity of attacker
The man police believe to be responsible for the terrorist attack in Westminster yesterday, Wednesday, 22 March, has now been formally identified as Khalid Masood.
Masood, aged 52 (25.12.1964), was born in Kent and detectives believe he was most recently living in the West Midlands. Masood was also known by a number of aliases.
Masood was not the subject of any current investigations and there was no prior intelligence about his intent to mount a terrorist attack.
However, he was known to police and has a range of previous convictions for assaults, including GBH, possession of offensive weapons and public order offences.
His first conviction was in November 1983 for criminal damage and his last conviction was in December 2003 for possession of a knife.
He has not been convicted for any terrorism offences.
Anyone with any information about Masood can call the Anti-Terrorist Hotline 0800 789 321.
Breaking: Westminster terrorist named as Khalid Masood
The man police believe to be responsible for the terrorist attack in Westminster has been formally identified as Khalid Masood, 52, Scotland Yard said.
Donations for family of murdered Pc pass £100k
Well-wishers have already donated more than £100,000 online for the family of murdered police officer Keith Palmer, reports Mark Malloy.
Multiple fundraising pages have been set up to help the loved ones of the husband and father who was stabbed outside Parliament, as well as other victims of the deadly Westminster attack.
The Metropolitan Police Federation launched an official memorial page at 9.13am on Thursday, which smashed its £100,000 target within hours. Read more here.
Donald Trump sends 'prayers and condolences' to American victim's family
US President Donald Trump has paid tribute to Westminster attack victim Kurt Cochran, saying he was "a great American":
A great American, Kurt Cochran, was killed in the London terror attack. My prayers and condolences are with his family and friends.— Donald J. Trump (@realDonaldTrump) March 23, 2017
Video: The most powerful testimonies from civilians caught up in attack
Boris Johnson lays into social media over radicalisation
Boris Johnson, the Foreign Secretary, has accused social media websites of inciting terrorism, reports Political Editor Gordon Rayner. Mr Johnson said:
"If we are going to defeat these guys we are going to have to engage not just miltarily but also to win in their hearts and minds and stop the stuff on the internet that is corrupting and polluting so many people.
"This is something the internet companies and the social media companies need to think about. They need to do more to take that stuff off their media.
"The incitements, information about how to become a terrorists, the radicalising sermons and messages, that needs to come down ."
Police create Westminster attack condolences website
The Met Police have set up a website for people to send messages of condolence after the death of Pc Keith Palmer and two civilians. You can leave a message here.
Silence held in Spanish region where British victim's family originates
At least 100 people have attended a memorial in Spain to commemorate Aysha Frade, who was also killed in the terror attack.
A minute's silence was held in the Galician municipality of Betanzos, where the British woman's family originates and where she spent her summers.
Betanzos councillor Andres Hermida said the community in Spain was in "enormous pain" and shrouded in an "atmosphere of sadness".
He said: "We had a minute's silence in the Plaza de la Constitucion outside the local government building and we have declared three days of mourning, which will include flying the flag at half mast until Saturday.
"About 100 people attended despite the rainy weather."
'I wouldn't recognise them if I saw them', says landlord of Birmingham flat where three men arrested
Patrick Sawer reports from Birmingham:
Farhad Makanvand, the owner of the flat above a Persian restaurant raided by police in Birmingham on Wednesday night, told The Telegraph: "I own the restaurant and the two flats. Three men were arrested from my seven-bedroom flat.
"I don't know who the men were because I let it out via an agency. I wasn't in the restaurant at the time of the raid, I found out about it from neighbours.
"I voluntarily gave a statement to police this morning. But if I saw the three men who live there I wouldn't recognise them."
Mr Makanvand said he had been left "deeply shocked" by the sequence of events which culminated in the raid on his premises on Birmingham's Hagley Road.
He said he was cooperating fully with the police to help them with their investigations into the attack on Parliament.
American tourist is third victim of Westminster terror attack
The third victim of the Westminster terror attack has been identified as Kurt Cochran, an American tourist.
In his 50s, he is believed to have been killed while walking on Westminster Bridge as a car mowed down pedestrians. Mr Cochran's wife, Melissa, was also injured in the attack.
For more on the other victims, click here.
Terrorist was shot dead by Sir Michael Fallon's bodyguard
A Cabinet minister's bodyguard was the officer to stop the Westminster terrorist, it has emerged, raising fresh questions about Parliament's security arrangements, reports Gordon Rayner and Kate McCann.
The close protection officer - understood to be the bodyguard of Defence Secretary Sir Michael Fallon - ran towards the knife-wielding attacker and shot him three times in the chest from short range. Read more here.Te
French foreign minister flies to London to visit pupils hurt in attack
France has opened an inquiry into "flagrant attempted murder" after three high school students were injured in the Westmisnter attack, reports Henry Samuel. It is being handled by domestic security, DGSI, and the French anti-terror body SDAT.
Meanwhile, Jean-Marc Ayrault, the French foreign minister, has flown directly to London from Washington to show support and to pay a visit to the French pupils caught up in the drama.
"I was adamant to make a stop in London to convey a message of solidarity to the British people," he said. "We will not forget the solidarity the British people demonstrated when we suffered (terror attacks)."
"When we heard the news of the attack, we immediately felt a shock, particularly because young French pupils were involved. We must continue to fight. It is a symbol of democracy that came under attack."
Some 56 pupils from Saint-Joseph lycée in Cocarneau, Brittany were due to be debriefed by police at the hotel Marriott Westminster before flying home in two French military planes.
"We organised their repatriation by plane. It will take place today," said Juliette Meadel, French secretary of state in charge of aid to victims.
Breaking: Belgian police arrest man trying to drive into crowd in Antwerp
In a separate development, one person has been detained after a car tried to enter a shopping street in Antwerp at high speed, according to Belgium police.
Additional military and police have been deployed to the area. Follow updates here.
Video: Victims were being thrown 20 feet into the air
Tobias Ellwood's mother speaks of pride at his bravery
Every mother is proud of their son, but Dr Caroline Ellwood has an extra reason, reports Joe Shute.
Her son is Tobias Ellwood, the MP who battled to the save the life of fatally wounded Pc Keith Palmer.
Speaking to the Telegraph, Dr Caroline Ellwood, said: “I am very proud of my son. But what he did was only what I would have expected him to do. I don’t think he was particularly a hero.
Read the full piece here.
Paul Nuttall: Muslim communities have to do more to root out 'this cancer of radicalisation'
Speaking near Parliament, Ukip leader Paul Nuttall said the country must ensure there was no "knee-jerk" reaction after the "evil" attack and called on people to "come together and ensure that we move on forward".
He said he was "horrified" by the "act of insanity", but said that Muslim communities had to "do more to root out this cancer of radicalisation".
Mr Nuttall said that "we have to do something about people who will be returning from Syria", who he said should not be allowed back into the UK.
However, he added: "Let's be frank about this, only a tiny fragment of the Muslim community in this country are radicalised - probably one per cent - so the majority should not be blamed for the actions of one lunatic.
"But what will become clear I'm sure is that this is a lone wolf attack, but lone wolf attacks aren't always just committed by one person on their own. There'll be other people who would have known about this... and I just wonder whether more could have been done to stop them."
Duchess of Cambridge sends 'thoughts and prayers'
The Duchess of Cambridge, speaking at an event in London, has sent her "thoughts and prayers" to all those "sadly affected by yesterday's terrible attack in Westminster", reports Hannah Furness.
Speaking at the launch of Best Beginnings, a charity project for mental health in parenthood, she said: "Before I begin, I know you would all want to join me in sending our thoughts and prayers to all those sadly affected by yesterday’s terrible attack in Westminster.
"We will be thinking of all the families, as we discuss the important issues we're here to talk about."
Westminster Bridge reopens less than 24 hours after attack
Westminster Bridge has reopened less than 24 hours after Wednesday's attack, police on duty in the area have confirmed.
Westminster bridge just reopened pic.twitter.com/43xDgWMS16— Lexi Finnigan (@LexiFinnigan) March 23, 2017
Scottish independence referendum debate put on hold
First Minister Nicola Sturgeon has said Scotland stands in solidarity with London following the "heinous" terrorist attack on Westminster.
In a bid to reassure people, she said there had been a "substantial uplift in armed officers on duty" across Scotland's major cities.
The First Minister, though, also urged the public to go about their business "confidently and defiantly".
Flags were at half-mast at Holyrood as Ms Sturgeon updated MSPs on the situation.
The attack took place while MSPs were debating Ms Sturgeon's plans for a second Scottish independence referendum to be held in the wake of Brexit.
The debate has now been put on hold until Tuesday March 28, when Holyrood is likely to vote to give the First Minister the authority to seek talks with Westminster over a section 30 agreement, the mechanism to transfer the powers for a legally-binding ballot to take place
Barack Obama: No act of terror can shake the strength and resilience of our British ally
My heart goes out to the victims and their families in London. No act of terror can shake the strength and resilience of our British ally.— Barack Obama (@BarackObama) March 23, 2017
Muslim group raises £3,000 in an hour in support of Westminster victims
Muslim community raised over £3,000 in support of the Westminster victims and their families, Helena Horton reports.
Muslims United for London co-ordinated a crowdfunding campaign which saw the amount of money skyrocket in the first hour.
Gallery: Social media pays tribute with memes, illustrations and defiant quotes
Statement from Islamic State, which singled out UK as next target
The statement reads: "The attacker is a ISIS soldier who answered the call to attack countries participating in the anti-ISIS coalition."
Josie Ensor, the Telegraph's Middle East Correspondent, reports the group's late spokesman, Abu Mohammed Adnani's, previously called on followers abroad: "If you are not able to find an IED or a bullet, then single out the disbelieving American, Frenchman, or any of their allies.
"Smash his head with a rock, or slaughter him with a knife, or run him over with your car.”
Isil has been explicitly threatening attacks on Britain for the last 18 months. At the end of a propaganda video claiming the Paris attacks in November 2015, Isil singled out the UK as its next target.
Isil claims responsibility for Westminster attack
Islamic State of Iraq and the Levant (Isil) has claimed responsibility for the attack in Westminster, according to Isil's Amaq news agency.
Its statement says: "Attacker in front of the British parliament yesterday was an Islamic State soldier".
Security stepped up in Rome as EU leaders prepare to descend on city
Security is being stepped up in Rome in light of the London terrorist attack as EU leaders prepare to descend on the city for the 60th anniversary of the Treaty of Rome on Saturday, reports Nick Squires in Rome.
More than 3,000 police are being deployed to the streets of the capital. Authorities are already deeply concerned about the six demonstrations planned on Saturday, but they are now worried about the risk of a terrorist attack too.
Security measures have been stepped up around the Italian parliament, the president's palace on the Quirinale Hill as well as at well-known monuments such as the Colosseum. Police and the Carabinieri are deploying armoured vehicles equipped with water cannon.
It comes as it emerged an Italian woman is among the injured from the attack. She is believed to be from Rome.
A second Italian, a woman from Bologna, is also reported to have been lightly injured when the terrorist rammed his car into crowds on Westminster Bridge.
"When the attack happened, my niece was walking across the bridge and was then crushed against the railings," the woman's aunt told Italian television.
"She seems to have been shielded from the worst of it by the group of French children who were hit. It is just awful, it's so shocking what happened."
Boris Johnson: 'The worst way to lose the war on terror is to be terrified, and we are not terrified'
Boris Johnson, in New York to attend the UN later today, has been speaking on the Morning Joe breakfast show, reports Harriet Alexander.
He was asked about the row about Sadiq Khan's September 2016 remarks that living with the threat of terrorism was a part of life in a big city - something which Donald Trump's son Don Jr misquoted, tweeting yesterday: "You have to be kidding me?" The Foreign Secretary said:
"There are always a certain number – for all the time I was mayor, we had people we were monitoring and watching.
"The crucial message, I think, was the one the Prime Minister gave this morning. It’s a city getting on with its business – parliament is running, transport is working.
"The worst way to lose the war on terror is to be terrified, and we are not terrified."
Video: Defiant London commuters vow to carry on regardless
Video: MP breaks down as he pays tribute to his friend Pc Keith Palmer
A Conservative MP was on the edge of tears as he paid tribute to Pc Keith Palmer who he met as “Gunner Palmer” when they served in the Army 25 years ago.
James Cleverly said Pc Palmer was "a strong, professional public servant and it was a delight to meet him here again only a few months after being elected”.
Mr Cleverly, his voice cracking with emotion, asked if Theresa May would recognise the work that he did and other police officers “consider recognising his gallantry and sacrifice formally with a posthumous recognition”.
Mrs May replied Pc Palmer had paid the “ultimate sacrifice” by giving his life in “the heart of democracy”.
The Prime Minister added she can assure Mr Cleverly that “the issue that he has raised is of course one that will be considered in due course”.
Hero MP Tobias Ellwood might receive bravery medal
PM says "proper consideration" will be given to a bravery medal for Tobias Ellwood— Gordon Rayner (@gordonrayner) March 23, 2017
As the suggestion was made by a Conservative MP, Mr Ellwood shook his head and looked at the floor.
Woman who plunged into Thames as terrorist struck was on holiday with her fiance
The woman “thrown into the Thames” from Westminster Bridge was enjoying a holiday with her fiance to celebrate his birthday, reports Henry Bodkin.
Police rescued Andreea Cristea, a 29-year-old architect, from the river following the attack, and she is now in a serious condition in hospital.
Her partner, engineer Andrei Burnaz, was also taken to hospital with a fractured foot.
The couple had been walking across the bridge towards the London Eye when the terrorist ploughed a 4x4 car through pedestrians, before getting out and stabbing Pc Keith Palmer to death at the entrance to Parliament.
Paul Ciocoiu, a spokesman for the Ministry of Foreign Affairs in Romania, said he believed MIss Cristea had been “hit by a car and then thrown into the Thames”.
The pair were on their way to meet a friend, Patrick Tracey, from Derbyshire, who said: 'They never made it. I phoned and could here shouts in the background and knew instantly something was wrong. I'm in shock."
Video: Forensics officers search scene of Pc's murder
Around 10 people in blue overalls, apparently forensics officers, were seen on their hands and knees, searching the cobblestones in a horizontal line in New Palace Yard, near where Pc Palmer was stabbed and the attacker was shot.
An area of the courtyard remained cordoned off and a blue tent was in the spot where Pc Palmer fell.
Queen sends 'thoughts, prayers, and deepest sympathy'
The Queen has said her "thoughts, prayers, and deepest sympathy" are with all those who have been affected by yesterday's "awful violence". She wrote in a message to Acting Commissioner of the Met Craig Mackey:
"Following the shocking events in Westminster, Prince Philip and I are sorry that we will not be able to open the New Scotland Yard building as planned today, for very understandable reasons. I look forward to visiting at a later date.
"My thoughts, prayers, and deepest sympathy are with all those who have been affected by yesterday's awful violence.
"I know I speak for everyone in expressing my enduring thanks and admiration for the members of the Metropolitan Police Service and all who work so selflessly to help and protect others."
MP to visit 'brave' children who were in Parliament yesterday
Today I'll go to Holy Family primary in Small Heath to give these letters to the children who were in parliament yesterday. So proud of them pic.twitter.com/wtSfCRCPtf— Jess Phillips MP (@jessphillips) March 23, 2017
Public donate thousands for family of Pc Keith Palmer
Online donations have poured in for Pc Keith Palmer, who was killed in the terror attack in the heart of the capital.
More than £12,000 has been donated to help support the family of the murdered PC who had worked for the Metropolitan Police for 15 years.
Enterprise confirms car used in attack was hired from its branch
The Hyundai vehicle used by the attacker was rented from car hire firm Enterprise, reportedly its Solihill branch.
In a statement, the company said: "We can confirm that the car used in the tragic attack in London yesterday afternoon was one of ours.
"An employee identified the vehicle after seeing the licence plate in an image online. We ran another check to verify, and immediately contacted the authorities.
"We are co-operating fully with the authorities and will provide any assistance that we can to the investigation. Our thoughts are very much with the victims of this terrible tragedy."
Pope sends message assuring the 'nation of his prayers'
Pope Francis has sent a message to Cardinal Vincent Nichols, Archbishop of Westminster, assuring the "nation of his prayers" after yesterday's terror attack.
The message, communicated via the Holy See's Secretary of State, Cardinal Pietro Parolin, commends those who died to the loving mercy of Almighty God as Pope Francis "invokes divine strength and peace upon their grieving families".
Jeremy Corbyn: 'We are united by our humanity and by our democratic values'
Labour leader Jeremy Corbyn also paid tribute to Keith Palmer, the police officer who lost his life in the attack, and to the police and security services who "keep us safe every day" on the Parliamentary estate.
He said: "Today we are united by our humanity and by our democratic values and by that human impulse of solidarity to stand together in times of darkness and adversity.
"I express my condolences to the family and friends of police officer Keith Palmer who gave his life yesterday in defence of the public and of our democracy."
He added: "We especially pay tribute to the bravery of those who took action to stop the perpetrator of yesterday's assault."
Tobias Ellwood returns to Commons hours after trying to save Pc's life
A Government minister has returned to the Commons just hours after running towards gunfire in a bid to save the life of a policeman, reports Christopher Hope.
Conservative frontbencher Tobias Ellwood walked into the chamber shortly before the end of women and equalities questions, standing up at the back and watching on with arms folded.
Colleague Richard Benyon shared a word with Mr Ellwood as MPs awaited Prime Minister Theresa May's statement on the Westminster attack. He had his head bowed as Mrs May praised his bravery.
Foreign Office minister Mr Ellwood, a former soldier, gave mouth-to-mouth resuscitation to Pc Keith Palmer and attempted to stem the flow of blood amid the carnage in New Palace Yard.
Mr Ellwood was pictured with blood on his face and clothes. His life has previously been touched by an atrocity, as his brother Jonathan was killed in the 2002 Bali bombing.
More from Theresa May's speech on the victims and the attacker
On the injured
Mrs May said those injured included 12 Britons, three French children, two Romanians, four South Koreans, two Greeks, and one each from Germany, Poland, Ireland, China, Italy and the United States. Three police officers were also hurt, two of them seriously.
Mrs May said the victims also included three police officers who were returning from an event to recognise their bravery.
"Two of those three remain in a serious condition," she added.
On the attacker
Mrs May said the attacker had been identified as someone known by police and MI5, and the working assumption was that he was inspired by Islamist terrorism.
She said it was still believed that the attacker acted alone and there was "no reason to believe" further attacks on the public were planned. She added:
"His identity is known to the police and MI5 and when operational considerations allow, he will be publicly identified.
"What I can confirm is that the man was British-born and that some years ago he was once investigated by MI5 in relation to concerns about violent extremism.
"He was a peripheral figure. The case is historic. He was not part of the current intelligence picture.
"There was no prior intelligence of his intent or of the plot."
'Our values will prevail'
Mrs May concluded her statement by saying: "Our values will prevail."
Mrs May said it was an attack on free people all over the world as she thanked global allies including US President Donald Trump for their support. The PM said:
"We meet here in the oldest of all parliaments because we know that democracy and the values it entails will always prevail.
"Those values - free speech, liberty, human rights, and the rule of law - are embodied here in this place but they are shared by free people around the world.
"A terrorist came to the place where people of all nationalities and cultures gather to celebrate what it means to be free. And he took out his rage indiscriminately against innocent men, women and children.
"This was an attack on free people everywhere, and on behalf of the British people I would like to thank our friends and allies around the world who have made it clear that they stand with us at this time."
Praise for police for 'heroically' doing their job
Mrs May praised the police for "heroically" doing their job by stopping the attacker getting access to Parliament. She said:
"We should be clear first of all that an attacker attempted to break into Parliament and was shot dead within 20 yards of the gate.
"If his intention was to gain access to this building, we should be clear that he did not succeed. "The police heroically did their job."
Terrorist was investigated by MI5 in relation to concerns about violent extremism, May reveals
Theresa May has just disclosed in the Commons: "The man was British born and some years ago he was investigated by MI5 in relation to concerns about violent extremism."
Mrs May said he was a "peripheral" figure, adding: "He was not part of the current intelligence picture."
'We are not afraid': Theresa May makes statement in House of Commons
Prime Minister Theresa May is currently making a statement in the House of Commons.
She said "an act of terrorism tried to silence democracy", saying that "today we meet as normal as generations have done before us".
Mr May said she wanted to "deliver a simple message - we are not afraid and our resolve will never waiver in the face of terrorism".
Flowers and book of condolence left for Westminster victims
Several bunches of flowers have been laid in Westminster Hall alongside what appeared to be a book of condolence.
They were left in a small, roped-off area in what is the oldest part of the building of Parliament.
Stopped here on the way into Parliament to give thanks for PC Keith Palmer & all those who put themselves at risk to protect the public. pic.twitter.com/hend6k9Qup— Maeve Sherlock (@MaeveSherlock) March 23, 2017
Eighth arrest in Westminster terror attack investigation
Scotland Yard has just announced that eight people have now been arrested as part of the investigation into the Westminster terror attack.
We have now made a total of eight arrests as part of the ongoing Counter Terrorism operation #WestminsterAttack— Metropolitan Police (@metpoliceuk) March 23, 2017
MI5 is 'fully mobilised in support of the police', says chief in rare public statement
Director General of MI5 Andrew Parker has condemned the Westminster attack as "appalling and disgusting" and said the agency's operational response is "fully mobilised in support of the police". He said in a statement:
"The thoughts of the men and women of MI5 are with the families of those killed in Westminster yesterday, and with the other innocent people injured in this appalling and disgusting attack.
"We stand shoulder to shoulder with our police colleagues, grieving at their loss while also applauding the professional excellence of their response.
"As Acting Deputy Commissioner (Mark) Rowley said, the security community prepares for such awful events - while working tirelessly to prevent them.
"The MI5 operational response is fully mobilised in support of the police."
Video: MP pays emotional tribute to the dead
Scottish politician Tasmina Ahmed-Sheikh paid a tearful tribute to those who lost their lives in the terror attack in Westminster:
Pictures from sombre Westminster as MPs return to 'business as usual'
A sombre calm hung over Westminster the morning after the attack. There were none of the large groups of tourists usually seen taking photos outside Big Ben.
Instead the whole area was cordoned off as MPs and staff working in Parliament flashed their passes and filed quietly into an entrance at the side of the building.
The police presence is heavy with dozens of officers, many armed with guns, keeping guard at the entrance.
But despite the shock of the terror attack, MPs were determined it will be business as usual in Parliament.
SNP MP Alan Brown (Kilmarnock and Loudoun) said: "I feel a slight sense of apprehension, but we can't let the crimes of one person prevent the working of Parliament.
"Obviously, our thoughts are with the family of the policeman and other people who were killed.
"I suspect it will be an emotional day, it will certainly be a very sombre day, in Parliament. Today it is back to business.
"I've got a question on the order paper and a constituency matter to raise, so it is back to the day job of being an MP."
Barry Gardiner, the shadow international trade secretary, said: "Everything has to be seen to get back to normal as quickly as possible so that people realise that this sort of attack is ultimately a futile gesture.
"I think the police have been absolutely right not to release details of the attacker, to give it no publicity.
"What happened yesterday was sordid, shameful and vile. The attacker caused the most appalling carnage in the lives of 20 to 25 families.
"I think everyone in Parliament will want to pay tribute to the security services and the police and how they responded yesterday, and the officer who tragically died."
Minute's silence was chosen for 9.33am to honour murdered Pc's 933 shoulder number
A minute's silence was held nationwide at 9.33am, including in the Palace of Westminster and at New Scotland Yard, to commemorate the three innocent people killed in Wednesday's assault on Westminster.
The time for the silence was chosen in honour of murdered police officer Keith Palmer's shoulder number - 933.
Defiant MPs stood side by side in silence as they came together to remember those injured and killed in the attack.
With the benches full and heads bowed, the debating chamber usually full of noise observed a minute of silence.
Speaker John Bercow said: "Colleagues, in respectful memory of those who lost their lives in yesterday's attack and of all of the casualties, we shall now observe a minute's silence."
'They were all dressed in black and armed with machine guns' : The moment police stormed Birmingham flat linked to terror attack
Neighbours have described the dramatic moment armed police stormed a Birmingham flat linked to the Westminster terror attack.
Stunned residents watched as more than a dozen black-clad officers equipped with machine guns smashed their way in to an address in Hagley Road at about 11pm on Wednesday.
The Metropolitan Police have confirmed the overnight raid was part of a wider operation in which several addresses were searched and seven arrests made.
One witness, who works in a shop near the second-floor flat, said: "The man from London lived here." He added: "They came and arrested three men."
Stuart Bailey, who lives four doors down, was going for a drink with his friend when an armed officer shouted for him to "Go left".
The 25-year-old said: "There were a load of armed police in the street and on the pavement and I could see three or four in front of me.
"They were all dressed in black and armed with what looked like MP5s (submachine guns) and one of them had six ammunition magazines strapped to his leg.
"I wasn't allowed back in my property for an hour."
The road was sealed off by balaclava-wearing officers for several hours as the raid continued, although the busy main road into the city has since reopened.
Another man who have lived in the neighbouring flats said he was "scared and frightened" when he glanced out of the window and saw about a dozen armed police wearing Kevlar helmets and body armour in the street.
One man, asked if he knew anything about the men in the flat, recalled two men living there.
He heard one man in the flat speaking on the phone in what he described as an "Arabic or Pakistani accent", saying he had heard it "for the last two or three nights".
Describing the raid, he said: "There were armed police and some important-looking guys in suits as well.
"They had tools and they were trying to break the doors down, trying to force themselves in.
"We were basically staying in our house, we didn't know what was happening. Even today still we don't know what has happened.
"Somebody said it was to do with the attack on Parliament, and now we're very scared and frightened."
On Thursday morning there was still police activity at the flat, with one of its windows covered with cardboard.
MPs tweet pictures of their 'grey and eerie' walks to Westminster
A grey, eerie morning in Westminster. Thinking of those who have lost loved ones. pic.twitter.com/9Cwnj9z120— Ian Lucas (@IanCLucas) March 23, 2017
The view from my office-normally a bustling Westminster Bridge-Today a crime scene-my thoughts with those killed & injured & their families pic.twitter.com/V6J741QIk8— Albert Owen MP (@AlbertOwenMP) March 23, 2017
Lord Carlile: 'It is very rare for lone wolves to have no connections'
Lord Carlile, the former independent government reviewer of terrorism legislation, told BBC Radio 4: "This is the sort of attack that we feared, the sort of attack that was predicted by the authorities.
"There may have to be changes in the way that Parliament and other major public buildings are guarded. We have to study what occurred and lean the lessons. It is very rare for so called lone wolves to have no connections whatsoever.
"However, I suspect that when we see the background of this perpetrator we will probably see that he was inspired by something external and we have to address the causes that drive people to commit these terrible crimes."
Victim was 'highly regarded and loved'
Aysha Frade, one of the victims of the Westminster terror attack, was "a highly regarded and loved" member of staff at DLD College London, her principal Rachel Borland said. Read more here.
Ms Borland said:
"We are all deeply shocked and saddened at the news that one of the victims yesterday was a member of our staff, Aysha Frade.
"All our thoughts and our deepest sympathies are with her family. We will be offering every support we can to them as they try to come to terms with their devastating loss.
"Aysha worked as a member of our administration team at the college. She was highly regarded and loved by our students and by her colleagues. She will be deeply missed by all of us."
Brendan Cox: ‘Westminster attacker represents British Muslims no more than Jo Cox’s killer represents Yorkshire’
#WeAreNotAfraid: Defiant Londoners return to work after attack
Defiant Londoners are heading back to work "as normal", telling those responsible the events did not succeed in crushing their spirits and making them afraid, reports Mark Molloy.
A defiant trend popped up on Twitter, as commuters going about their business in the capital in the wake of the attack tweeted "we are not afraid".
Security review to investigate if Palace of Westminster police should be armed
Security arrangements at Westminster are to be reviewed following Wednesday's horrific attack. Defence Secretary Sir Michael Fallon said the review would look at whether current security arrangements are "adequate" and whether police at the front gates should be armed.
But he said it was neither possible nor desirable to seal Parliament off from the public.
Recap: What we know so far about the Westminster attack
If you're just joining us this morning, here's a quick recap of what we know so far about the Westminster attack. You can read a fuller version here.
- Four people have died - a police officer, the attacker, a woman in her mid 40s and a man in his mid 50s
- The officer was Pc Keith Palmer, a 48-year-old husband and father with 15 years of police service
- Seven people have been arrested and six addresses raided across London, Birmingham and elsewhere
- The woman was killed on Westminster Bridge as a number of pedestrians were mowed down by a grey Hyundai
- It is believed the man was also killed in the incident on the bridge
- Seven people are in a critical condition, and 29 have been treated in hospital
- One woman ended up in the Thames and was treated for serious injuries after being pulled from the water
- The attacker, armed with two large knives, jumped out of the car after smashing it into the railings encircling the Palace of Westminster, fatally stabbing Pc Palmer as he entered the grounds. He was shot dead moments later by another officer
- Defence Secretary Michael Fallon has said the working assumption is that the attack is linked to Islamic terrorism
Parliament and Whitehall to hold minute's silence
MPs, peers and staff working in Parliament and Whitehall will observe a minute's silence at 9.33am to pay respects to the victims of the terror attack.
A large area around the Palace of Westminster, including Parliament Square and Westminster Bridge, remained cordoned off on Thursday morning, but staff were able to access the building and return to work.
The House of Commons will sit after prayers at 9.30am, with the minute's silence expected to follow, and then questions to Liam Fox and ministers from his Department for International Trade.
Two people in overalls and masks were seen sorting through material near the area in New Palace Yard where the attacker was shot and Pc Keith Palmer stabbed, and an area in the courtyard remained cordoned off.
The popular Terrace cafeteria was open and serving a hot breakfast as normal as MPs, peers and staff arrived for work.
The Union flag was flying at half-mast over the Houses of Parliament and other nearby buildings.
Forensics officers remain in Westminster this morning
Westminster still in lockdown this morning. Forensics officers have been working through the night and are still here.— Gordon Rayner (@gordonrayner) March 23, 2017
Investigators 'looking at who might have helped' attacker
Sir Michael Fallon, the Defence Secretary said investigators were working around the clock.
He said: "They have been working right through the night, looking into his background, how he got hold of the vehicle, where the vehicle has been in the last day or two, and who may, or may not, have helped him."
Asked if he was known to police, Sir Michael said: "I can't confirm that, you will have to ask the police that."
First named civilian victim of attack 'was picking up her children from school'
One of the victims has been named by Spanish reports as Aysha Frade, a 43-year-old British woman of Galician origin, reports Helena Horton.
Mrs Frade was a married mother-of-two, according to Spanish newspaper La Voz de Galicia, who was believed to have been picking up her children from school.
According to reports, she was leaving work at the DLD college near the Westminster Bridge, where she was a department head and taught Spanish, when she lost her life. Read more here.
Revealed: The two war veterans who tried to save murdered Pc
Two war veterans were first on the scene to try and save the murdered police officer Keith Palmer after he was stabbed in the Parliament attack, Laura Hughes reports.
Former Staff Sgt Tony Davis and Captain Mike Crofts rushed to injured policeman and administered combat first aid, applying dressings and pressure to several of his wounds.
Friends of the former servicemen told The Telegraph they had "fought desperately" to save the married father and were "devastated" by his death.
What is the UK's terror threat level?
Michael Fallon: Working assumption is attack is linked to Islamic terrorism
Defence Secretary Michael Fallon has said the working assumption is that the Westminster attack is linked to "Islamic terrorism in some form".
Full statement from Mark Rowley, senior anti-terror officer
Here is the full statement on the Westminster terror attack made by Mark Rowley just now:
"Good morning - I am here to update you on our ongoing counter-terrorism operation following the horrific attack in Westminster.
"Greater clarity is now developing regarding the casualty figures as we have now collated information from the public and five hospitals - the latest figures I have are that there are currently four dead and 29 people were treated in hospital.
"We are still collating numbers of walking wounded and of those in hospital sadly seven of them are in a critical condition.
"Tragically the deaths included Pc Keith Palmer who was protecting Parliament, and two members of the public - a woman aged in her mid 40s and a man aged in his mid 50s.
"The fourth man of course was the terrorist who was shot dead by armed police at the scene.
"Hundreds of detectives have been working through the night and during that time I can confirm we have searched six addresses - and made seven arrests. The inquiries in Birmingham, London and other parts of the country continue.
"It is still our belief - which continues to be born out by our investigation - that this attacker acted alone yesterday and was inspired by international terrorism.
"To be explicit - at this stage, we have no specific information about further threats to the public.
"Clearly our investigation is ongoing - developing all the time - and is focused on his motivation, his preparation and associates.
"I do recognise that the media are making progress in identifying the attacker - I would continue to ask that his name is not published whilst we are at such a sensitive stage in our investigation - and as I state still conducting arrests and searches.
"The large and complicated crime scene remains in place and our work there continues - I would like to thank everyone for their support and patience as we finish this work.
"As people are out and about on the streets of the Capital this morning they will see more police officers on duty - armed and unarmed - and a mix of British Transport Police and the City of London.
"We have cancelled some leave and increased some duty hours and are working to make sure that we can out in force to reassure the public.
"We must not allow terrorists to create discord, distrust and fear.
"The police stand with all communities - later today a meeting of faith leaders will be held here at New Scotland Yard.
"Whilst our work to investigate and understand what happened yesterday continues with vigour - we must also reflect.
"I want to thank the public for their support and all their good wishes - I know it is appreciated by all those men and women who are out there today protecting us.
"Finally, I would also like to ask the public for their continued help and continued vigilance and if you see anything that causes you concern or raises your suspicions do not hesitate to call us - 0800 789 321 - or in an emergency 999. Thank you."
Video: Attacker killed three; 29 treated in hospital
Latest summary from overnight
Armed police have carried out an overnight raid on a Birmingham property, which was reportedly linked to the attack in Westminster on Wednesday.
Counter-terror detectives are continuing to search for clues about about how an armed attacker, believed to have "inspired by international terrorism", brought death and destruction to the streets of London.
Five people were killed in the "sick and depraved" terror attack, including a police officer who was stabbed and his assailant, while dozens more were injured.
Armed police launched a late-night raid on a second-floor flat above a row of shops on Hagley Road in Birmingham. Witnesses have said three people were taken away by police.
Sky News cited unnamed sources as saying the action was linked to the attack in London.
BBC Newsnight had earlier reported there was a suggestion the car used in the attack was hired from an address in Birmingham. However, this has not been confirmed.
Mark Rowley, Scotland Yard's top anti-terror officer, confirmed that 40 people were injured after the attacker - armed with two large knives - mowed down pedestrians with his car on Westminster Bridge then rushed at the gates in front of the Houses of Parliament, stabbing a plain-clothes policeman before he was shot by armed officers.
The officer who died was named as Keith Palmer, 48, a husband and father, whose bravery was hailed by colleagues, friends and the many MPs whom he was charged with protecting.
The three other fatalities are understood to be people who were hit by the car on Westminster Bridge.
Mr Rowley declined to name the attacker, but said police suspect he was "inspired by international terrorism" - and that they believed they knew who he was.
Witnesses described scenes of terror when gunfire rang out as the attacker approached a second officer within yards of the Houses of Parliament.
The suspected attacker was pictured being treated by paramedics on a stretcher, as two knives used in the assault lay on the ground nearby.
Paramedics fought to save his life and that of Mr Palmer on the floor of the cobbled courtyard in front of Parliament, with Foreign Office minister Tobias Ellwood among those who rushed to help.
"Heartbroken" former colleague, Conservative MP James Cleverly, paid tribute to the "lovely man" he had known for a quarter of a century.
"I've known Keith for 25 years. We served together in the Royal Artillery before he became a copper. A lovely man, a friend. I'm heartbroken.
"My thoughts are with the family, friends and colleagues of Pc Keith Palmer. A brave man."
The killer managed to get in through a vehicle gate in New Palace Yard – used by the Prime Minister and other members of the Government – because it was not locked.
Prime Minister Theresa May has described the attack as "sick and depraved".
Speaking outside 10 Downing Street after chairing a meeting of the Government's Cobra emergencies committee, Mrs May paid tribute to the "exceptional men and women" of the police force who responded to the attack.
Mrs May said that any attempt to defeat the values that Parliament stands for was "doomed to failure".
And she vowed: "We will all move forward together, never giving in to terror and never allowing the voices of hate and evil to drive us apart."
Footage later emerged of the moment police opened fire after the attacker drove a grey Hyundai i40 across Westminster Bridge before crashing it into railings then running through the gates of the Palace of Westminster.
In other developments, another woman who apparently fell into the Thames was rescued and given urgent medical treatment on a nearby pier.
London Ambulance Service said paramedics had treated at least 10 patients on Westminster Bridge. A party of French schoolchildren were among those targeted on the bridge, with three injured.
Mrs May, who was ushered away from Parliament after the attack, was chairing a meeting of the Government's emergency Cobra committee.
The attack left a trail of destruction as paramedics tended to victims on the bridge and at the gate.
Witnesses said the attacker was shot by police as he approached a second officer clutching his knife during the incident at about 2.45pm.