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