[UPDATE] Isis claims Manchester attack, police arrest man (23)

At least 22 people we killed and 59 others injured in the blast which took place on Monday night shortly after the end of the US singer’s performance.

Emergency response vehicles at the scene of a terrorist attack during a concert by US star Ariana Grande in Manchester on 23 May 2017. Picture: AFP.

LONDON - Isis has claimed responsibility for the suicide bomb attack in Manchester which killed 22 people and injured dozens at a British concert by US singer Ariana Grande on Monday.

British police have also confirmed that they have arrested a 23-year-old man in connection with the attack.

“With regards to last night's incident at the Manchester Arena, we can confirm we have arrested a 23-year-old man in South Manchester,” Greater Manchester Police said on Twitter on Tuesday.

At least 59 others were injured in the blast which took place on Monday night shortly after the end of the US singer’s performance.

Map showing the Manchester Arena where at least 22 people were killed in a suspected terror attack during a concert by US star Ariana Grande on Monday.

At a press conference on Tuesday morning, Greater Manchester Police chief constable Ian Hopkins said they were treating it as a terrorist incident.

He said at that stage they believed the attack was conducted by one man.

“The priority is to establish whether he was acting alone or as part of a network.

“The attacker... died at the arena. We believe the attacker was carrying an improvised explosive device which he detonated causing this atrocity.”

When asked about the age of the victims, Hopkins said he did not have that detail to hand but confirmed that there were children among the dead.

WATCH: The fatal Manchester Arena blast

British Prime Minister Theresa May has described the suicide bombing as callous and calculated, designed to inflict maximum carnage.

She has addressed the nation, saying that Britain’s spirit will never be broken by terrorists.

May says the timing and the location of the attack were carefully chosen.

“All acts of terrorism are cowardly attacks on innocent people but this attack stands out, for it’s appalling, sickening and cowardice. Deliberately targeting innocent, defenceless children and young people.”

She says the police investigation is moving swiftly.

“Let us remember those who died and let us celebrate those who hoped; safe in the knowledge that terrorists will never win.”

The queen has described the attack as an act of barbarity, while the first victim has been identified as an 18-year-old college student.