Ariana Grande concert: 22 killed in Manchester blast

PM Theresa May says authorities believe they know identity of suicide bomber who killed 22 people in Manchester.

UK police say they have arrested a 23-year old man in connection with a suicide bomb attack in Manchester which killed 23 people, including the attacker, and wounded dozens at a concert by US pop singer Ariana Grande.

"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.