The explosion outside Manchester Arena on Monday night that killed 22 people was a "callous terrorist attack", U.K. Prime Minister Theresa May told the media after chairing an emergency security meeting.
She said that 59 injured people are still being treated in hospitals across Manchester, some of them for life-threatening conditions.
The attack in Manchester following a pop concert was "among the worst terrorism we have experienced in the United Kingdom," May said.
"We know that among those killed and injured were many children and young people," she said.
"We struggle to comprehend the warped and twisted mind that sees a room packed with young children not as a scene to cherish, but as an opportunity for carnage."