Today marks the 15th anniversary of the tragic 7/7 terror attack in London which left scores dead after a series of explosions ripped through the capital.
The attacks on three London Underground trains and a double-decker bus killed 52 people as well as the bombers, and more than 700 people were injured.
Marking the anniversary on Tuesday, Mayor of London Sadiq Khan said: “Our capital will never forget the terrible events of that day, and my thoughts are with all those whose lives were changed forever."
Virtual commemorations are being held today to remember those who lost their lives in the attack, with planned physical commemoration events cancelled due to the ongoing coronavirus pandemic.
Here, we explain what happened during, and in the aftermath of, the 7/7 bombings:
When did the 7/7 bombings take place?
The 7/7 bombings took place during the morning of the 7th of July, in 2005.
Three of the four bombs went off just before 8:50am on Tube trains at Edgware Road, Aldgate and Russell Square that had departed from London's King's Cross station.
A fourth device was detonated about an hour later on a double-decker bus in Tavistock Square, not far from King's Cross.
The four people identified as responsible for the attack were: Mohammad Sidique Khan, 30; Shehzad Tanweer, 22; Germaine Lindsay, 19 and Hasib Hussain, 18.
Who were the victims of the 7/7 bombings?
A total of 52 people lost their lives as a result of the 7/7 bombings.
At Russell Square, 26 people were killed. They were:
James Adams, 32
Mr Adams was a church deacon from Bretton, in Peterborough. A mortgage adviser, he was caught in the Piccadilly Line Tube blast while on his way to work in the Strand.
Samantha Badham, 35
Ms Badham, a web designer, was killed while taking the Tube to work with her partner, Lee Harris. The pair had plans to meet friends that evening.
Philip Beer, 22
Mr Beer was a hair stylist from Hertfordshire and was on his way to work at a salon in Knightsbridge when he was killed.
Anna Brandt, 41
A Polish national, Ms Brandt had been living in London for three years before she was killed in the terror attack. The mother-of-two was travelling from her home in Wood Green to Hammersmith, where she worked as a cleaner, at the time of her death.
Ciaran Cassidy, 22
Mr Cassidy, who was raised in north London, was on his way to work on the morning of the attacks. A shop assistant and passionate Arsenal fan, he was planning a trip to Australia, for which he had been saving for several months, prior to his death.
Rachelle Chung For Yuen, 27
An accountant from Mauritius, Mrs Chung For Yuen was travelling to work in Piccadilly Circus when she was killed. She had settled in Britain five years earlier, in 2000, and later married her husband Billy in the capital in May 2004.
Elizabeth Daplyn, 26
Ms Daplyn was a hospital administrator from Highgate, north London, where she lived with her partner. She was a talented artist and musician.
Arthur Frederick, 60
Mr Frederick was a museum security guard living in north London prior to his death. He was born in Grenada before moving to island of Montserrat as a young man. After a 31-year career as a police officer there, he moved to London in 1997.
Karolina Gluck, 29
Ms Gluck was a Polish national who had moved to London three years prior to her death, to follow her twin sister, Magda. She boarded the Tube at Finsbury Park and was heading to work in Russell Square, where she worked as a receptionist at the Goodenough College before she was killed.
Gamze Gunoral, 24
A Turkish national, Ms Gunoral was staying at her aunt's house in north London while she was in the capital to study English. She had previously graduated from the University of Marmara, in Istanbul, where she was also born, as an actuary.
Lee Harris, 30
Mr Harris was an architect who lived in Tottenham with his partner, Ms Badham. Ms Badham died in the blast, while Mr Harris was taken to the Royal Free Hospital with serious head injuries sustained in the terror attack. He was in a coma for eight days before passing away on July 15.
Ojara Ikeagwu, 56
A mother-of-three, Mrs Ikeagwu was travelling from her home in Luton to her job as a social worker with Hounslow social services in west London when the attack took place. She had moved to England in 1976 with her husband.
Emily Jenkins, 24
Ms Jenkins, an aspiring midwife, was on her way to work when the attack occurred. She had grown up in Kew, south-west London, before later travelling widely and living in South America, Spain and Australia prior to her death.
Helen Jones, 28
Ms Jones was born in Templand, Dumfriesshire, but moved to London for work. She was commuting to work from her home in Holloway, where she had bought a flat only two weeks before the attack.
Susan Levy, 53
Ms Levy was the first victim of the attack to be formally identified. She was travelling from her home in Hertfordshire to the capital, where she worked as a legal secretary, when she died.
Shelley Mather, 26
Ms Mather, who was the only New Zealander to die in the attack, had been living in the capital for three years. She left her native country in 2002 for a tour of Europe and enjoyed the experience so much that she opted to become a tour guide.
Michael Matsushita, 37
A Vietnamese-American who had moved to Islington a month prior to the attack, Mr Matsushita was travelling to a new job in IT recruitment based in Holborn when he was killed. Prior to arriving in London, he had lived in New York for many years after emigrating as a child to the United States from Vietnam.
James Mayes, 28
Mr Mayes worked as an analyst at the Healthcare Commission prior to his death. He was travelling to a seminar in Holborn at the time of the attack.
Behnaz Mozakka, 47
An Iranian-born mother-of-two, Ms Mozakka was commuting from Finchley to her job as a biomedical officer at Great Ormond Street Children's Hospital when she was killed. She was born in the Iranian city of Shiraz before moving to the capital Tehran, where she met her husband, and eventually relocating in London.
Mihaela Otto, 46
Mother-of-two Ms Otto was a dental technician from Mill Hill, north London, and on her way to her place of work in Knightsbridge when she was killed. She was brought up in Romania and moved to London in 1984, following in the footsteps of her sister.
Atique Sharifi, 24
An Afghan national, Mr Sharifi fled to London from conflict in his home country three years prior to the terror attack. He had been studying English at West Thames College prior to his death.
Ihab Slimane, 24
Mr Slimane was in the capital studying English at the time of the terror attack. From Lyon, in France, he was of Tunisian origin and had managed to secure work as a waiter at a French restaurant in the West End prior to his death.
Christian Small, 28
Mr Small was travelling to his job in advertising sales in Holborn from his flat in Walthamstow at the time of the attack. He was a keen sportsman and had been on a trip to West Africa to research his family origins prior to his death.
Monika Suchocka, 23
A Polish national, Ms Suchocka was a trainee accountant who was living in Archway, north London. She had only arrived in London two months prior to the terror attack having first went abroad in 2002 to study in Germany, before she travelled to the United States to study English in the summer of 2003.
Mala Trivedi, 51
Ms Trivedi, a radiographer, was travelling to her place of work at Great Ormond Street hospital from her home in Wembley when she was killed. A mother-of-one, she was born and educated in Nairobi, Kenya, where she also met her husband in 1968.
Adrian Johnson, 37
A father-of-two from Nottinghamshire, Mr Johnson was travelling to work in London at the time of the terror attack. He was a sports enthusiast and enjoyed golf, playing hockey at county level and supporting Mansfield Town Football Club.
At Tavistock Square, 13 people were killed. They were:
Anthony Fatayi-Williams, 26
Mr Fatayi-Williams was an oil executive from Hendon, north-west London. Born to Nigerian parents, he divided his childhood between Britain, France and Nigeria and attended school in Sevenoaks, Kent, Paris and Lagos. He was travelling to work when he was killed.
Jamie Gordon, 30
Mr Gordon was travelling to work at the time of the terror attack. He was born in London to a Zimbabwean mother and a Scottish father before moving to Harare as a child. He later returned to England to complete his education and begin a career in finance prior to his death.
Giles Hart, 55
Born in Khartoum, Sudan, to English parents, Mr Hart was a prominent pro-democracy activist prior to his death. A British Telecom engineer and father-of-two, he was travelling to his job in Islington when he was killed. Mr Hart was posthumously granted the Knights Cross of the Order of Merit of the Republic of Poland, for his services to democracy, in the wake of the terror attack.
Marie Hartley, 34
Mother-of-two Ms Hartley was born and educated in Lanashire before later joining Hambledon Studios as an artist, where she worked until her death. She was travelling to London from Oswaldtwistle to try to recruit new artists at an art exhibition in Islington at the time of the terror attack.
Miriam Hyman, 31
Ms Hyamn was a freelance picture editor from Barnet, north London. She was born, graduated and died all within one square mile in London, having been born in University College Hospital and having graduated from University College London. Ms Hyman was on her way to work in Canary Wharf when she was killed.
Shahara Islam, 20
Ms Islam grew up in east London and worked as a cashier for the Co-operative Bank in Islington prior to her death. Her family described her as "an Eastender, a Londoner and British, but above all a true Muslim and proud to be so," after she was killed.
Neetu Jain, 37
Ms Jain had just started a new job with an IT firm when she was caught up in the terror attack. She was born in Delhi before moving to England as a child. Ms Jain was preparing to marry her partner when she was killed.
Sam Ly, 28
The only Australian killed in the bombings, Mr Ly was in the UK on a working holiday with his long-term girlfriend, Mandy Ha. He was born in Vietnam before his family went on to settle in Melbourne, Australia. Mr Ly was recovered from the wreckage of the bus with serious injuries, but died in hospital a week later.
Shyanuja Parathasangary, 30
A Sri Lankan national, Ms Parathasangary was heading for work at the Royal Mail's Old Street branch when she was killed. She had earlier moved to England as a child before graduating from London's South Bank University. Ms Parathasangary was refurbishing a house a couple of doors away from their parents with her sister prior to the terror attacks.
Anat Rosenberg, 39
An Israeli charity administrator from north London, Ms Rosenberg was travelling to work from her boyfriend's property in Marylebone when she was killed. She had moved to London after being born in the Israeli coastal town of Hadera and attending high school in Jerusalem.
Philip Russell, 28
Mr Russell was commuting to his job as a financier for JP Morgan Asset Management at the time of the terror attack. Born in the Kent village of Pembury, he had shown an early interest in music before later studying a degree in business studies at Kingston University.
William Wise, 54
Mr Wise was an IT specialist from Notting Hill, west London. The son of a GP, he grew up in Hertfordshire
Gladys Wundowa, 50
Mother-of-two Ms Wundowa had already been working at her job as a cleaner at University College London for several hours before she was killed. After being born in Ghana, she later moved to London in 1983 as the maid of a Lebanese family. Three years later, she met her husband.
At Aldgate, seven people were killed. They were:
Lee Baisden, 34
Mr Baisden was standing right next to the Mr Tanweer when the latter detonated his explosive device. An accontant for the London Fire & Emergency Planning Authority, he had recently set up a new home with his boyfriend. He was travelling to his place of work in Westminster at the time he was killed.
Benedetta Ciaccia, 30
Ms Ciaccia was an IT business analyst from Norwich who worked for a publishing company. She was commuting to her job at Pearson Publishing in cental London from her home, which she lived in with her fiance, when she was killed. Ms Ciaccia had been born in Rome before later moving to England at the age of 19.
Richard Ellery, 21
Mr Ellery was on a rare trip to the capital when he was killed. The eldest of three children, he was born and raised in Southampton before moving to Ipswich after leaving school at 18 and taking up a job at a branch of Jessops Cameras in the city.
Richard Gray, 41
Father-of-two Mr Gray was travelling to work in the capital from Ipswich when he was killed. He was standing opposite Mr Tanweer when the latter detonated his explosive device. Born in Wiltshire, Mr Gray was a passionate hockey player and worked as a tax manager with chartered accountants FW Smith Riches.
Anne Moffat, 48
Ms Moffat was commuting from Harlow, Essex, to her job as head of marketing and communications for Girlguiding UK in the capital when she was killed. She had earlier in life studied art before moving to London, but later returned to her family home in Old Harlow to look after her ailing mother.
Carrie Taylor, 24
Aspiring novelist Ms Taylor was travelling to work at the Royal Society of Arts at the time of the terror attack. She was born in Sidcup, Kent, and grew up in Billericay, before discovering a passion for drama at a young age and going on to study it at Royal Holloway, University of London.
Fiona Stevenson, 29
Ms Stevenson was a solicitor living in central London, who was originally from Little Baddow, in Essex. She was killed just two weeks after buying a new flat in the Barbican complex in the City of London. Ms Stevenson had dreamed of becoming a lawyer since childhood.
At Edgware Road, six people were killed. They were:
Michael Stanley Brewster, 52
Father-of-two Mr Brewster was a senior project manager for Derbyshire County Council. He had been in London attending a conference prior to his death. He was a keen cyclist who also played football and golf and took part in triathlons to raise money for a local hospital.
Jonathan Downey, 34
Mr Downey grew up in Northamptonshire, lived in Milton Keynes and worked in human resources for the Royal Borough of Kensington and Chelsea. Prior to his death, he was planning to move to Ireland with his wife.
David Graham Foulkes, 22
Mr Foulkes was a media sales manager for the Guardian newspaper based in Manchester, where he lived with his parents and sister. He had been making plans to move in with his girlfriend before he was killed. Mr Foulkes was in London for a meeting with a colleague when the terror attack took place.
Colin William Morley, 52
Father-of-three Mr Morley was from Finchley, north London. He worked in advertising and marketing having earlier grown up and been educated in Surrey, Leeds and Liverpool. Mr Morley and his wife had been planning to move to St Albans in the spring of 2006.
Jennifer Vanda Nicholson, 24
Ms Nicholson was from Reading, Berkshire. A talented musician who played the piano and sang in choirs, she was travelling to her job at a music publishing company in central London when she was killed. Ms Nicholson was making plans to marry her boyfriend and have children prior to her death.
Laura Webb, 29
Ms Webb worked as a personal assistant with DDB Europe, an advertising company, based in Paddington. She lived in Islington having been brought up in Kingston Vale, Surrey. Ms Webb was the third child and only daughter of her parents.
What has been said today?
On the 15th anniversary of the terror attack, senior politicians have paid tribute to those killed on that fateful day in July, 2007.
Mayor of London, Sadiq Khan, shared a heartfelt message thanking the city's emergency services, saying: “Our capital will never forget the terrible events of that day, and my thoughts are with all those whose lives were changed forever.
"As we mark 15 years since the attack on our city, I want again to pay tribute to the heroic efforts of our emergency services and transport workers, who ran towards danger to save lives, on that awful day.
"The way that our city responded and stood united in the aftermath of the attack showed the world that our values of decency, tolerance and mutual respect will always overcome the hate of the terrorists.
"Today, we reaffirm our commitment to upholding these values. To those who wish to divide us and spread hatred, we send a clear message that they will never succeed, and that we are stronger together."
Prime Minister Boris Johnon also attended a memorial held at London's Hyde Park.
Placing flowers alongside a handwritten note, Mr Johnson wrote: "We grieve for those who were lost. We remember those who were injured. We defy those who would defy us."
A 30-minute video commemorating the 7/7 bombings will also be released at midday.