Manchester Arena explosion: What we know so far
Here are the main developments following the bombing at the end of a pop concert at Manchester Arena:
:: Twenty-two people have been killed and 59 people injured. Children were among the dead.
:: Two of the victims have been named - Georgina Callander, 18, and eight-year-old Saffie Rose Roussos
:: Several people are still missing after the attack.
:: Police say a lone male suicide bomber detonated an improvised explosive device.
:: Islamic State has claimed one of its members carried out the terror attack.
:: Live updates: Manchester suicide bombing
:: Police and security services believe they know the identity of the man behind the attack.
:: Police are working with counterterrorism officers and intelligence services to find out more about the attacker.
:: The bomber was carrying a rucksack, according to Sky sources.
:: Police were called at 10.33pm to reports of an explosion at the end of an Ariana Grande concert.
:: Victims described being thrown by the blast that scattered nuts and bolts across the floor.
:: The gig was sold out, and thousands of children and teenagers were in attendance.
:: The wounded were taken to eight hospitals around Greater Manchester.
:: Ariana Grande has tweeted: "broken. from the bottom of my heart, i am so so sorry. i don't have words."
:: The singer's management team, Scooter Braun Projects, said: "Words cannot express our sorrow for the victims and families harmed in this senseless attack. We mourn the lives of children and loved ones taken by this cowardly act."
:: Home Secretary Amber Rudd has said the explosion was a "barbaric attack deliberately targeting some of the most vulnerable in our society".
:: Theresa May has condemned the "appalling incident". The Prime Minister was due to chair a meeting of the Government's emergency COBRA committee on Tuesday morning.
:: MI5 described the attack as "disgusting".
:: General Election campaigning has been suspended.
:: A large cordon remains in place around Manchester Arena and Victoria train station, which backs on to the arena.
:: All trains and trams to the station have been cancelled.
:: The Manchester Arena is the largest indoor arena in Europe, and has a capacity of 21,000.
:: Music stars from Manchester and beyond react to 'gut-wrenching attack'
:: A vigil is being held in Albert Square, Manchester, from 6pm
:: It is the worst terror attack in the UK since 56 people were killed in the 7/7 London bombings in 2005.
:: A hotline has been set up for those with concerns over loved ones who remain unaccounted for. Those worried about their friends or family should call 0800 096 0095