At least 22 people are dead and 59 are injured after a suicide attack at Ariana Grande's concert in Britain's Manchester Arena. The bomber died after he detonated an explosive device around 10:30 p.m. on Monday night. The explosion took place outside the arena as the concert came to an end, according to police. Authorities have been treating the incident as a terror attack, but it is not yet clear whether the bomber acted alone or with others.