Manchester attack

At least 22 people were killed and 59 injured after a bomb exploded outside the Manchester Arena on Monday night, as concertgoers -- many of them children and young people -- were leaving an Ariana Grande show.

Abedi is believed to have died in the powerful blast, though he has not yet been formally identified by the coroner, Manchester police said.

Speaking at a news conference Tuesday afternoon, Chief Constable Ian Hopkins said that the force was working to determine whether others were also involved in the attack.

The move came after investigators were unable to rule out whether Manchester bombing suspect Salman Abedi acted alone, the prime minister said.

Military personnel will now be deployed to protect key sites.

Twenty-two people were killed and 59 injured when a suicide bomber attacked Manchester Arena on Monday evening.

'Sensible response'

The prime minister said soldiers would be placed in key public locations to support armed police in protecting the public.