HERE is what we know so far about the terror attack that has killed 22 people in Manchester overnight:

:: 22 people have been killed and 59 have been injured in the blast

:: Children are among the dead

:: The attack was carried out by a lone male suicide bomber who detonated an improvised explosive device. He died at the arena

:: Police are investigating whether he acted alone or was part of a network

:: A vigil will be held at 6pm on Tuesday, in Albert Square, Manchester,

:: It is the worst terrorist attack in the UK since 56 people were killed in the 7/7 London bombings in 2005.

:: The explosion rocked the Manchester Arena at the conclusion of a performance by the American star Ariana Grande.

:: Manchester Arena said the explosion happened outside the venue, as people began streaming from the doors.

:: Greater Manchester Police said they were called to the venue at around 10.33pm and approach roads were closed.

:: They said the blast was "being treated as a terrorist incident".

:: More than 400 officers were deployed on the operation throughout Monday night.

:: Manchester Victoria station was evacuated and trains cancelled.

:: The victims are being treated at eight hospitals across Greater Manchester, Chief Constable Ian Hopkins said.

:: President Donald Trump expressed his "deepest condolences" to the victims and branded the attackers "evil losers".

:: Extra police officers have been put on duty in London in the wake of the attack, Metropolitan Police Commissioner Cressida Dick announced.

:: Andy Burnham, the Greater Manchester metro mayor, called the atrocity "an evil act".

:: The Prime Minister condemned what was being treated as an "appalling terrorist attack" and said she would chair a meeting of the Government's emergency Cobra committee on Tuesday.

:: All national General Election campaigning was suspended after the explosion.

:: A controlled explosion was carried out by police at the Cathedral Gardens area near Manchester Arena shortly after 1.30am.

:: Police said the suspicious item at the centre of the controlled explosion was just abandoned clothing.

:: If you have concerns for family members police say call 0161-856 9400

:: Police are asking for photos or footage from the concert to be sent to UKPoliceImageAppeal.com