MANCHESTER, England – A suicide bomber blew himself up as young concert-goers left a show by the American singer Ariana Grande in the northern English city of Manchester, killing at least 22 people, some wearing the star’s trademark kitten ears and holding pink balloons as they fled.

Teenage screams filled the arena just after the explosion Monday night, which also killed the attacker and injured dozens. British Prime Minister Theresa May said Manchester had fallen victim to “a callous terrorist attack.”

“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,” she said.

Greater Manchester Police announced Tuesday that they had arrested a 23-year-old man in the south of the city in connection with the attack.

The attack sparked a nightlong search for loved-ones, parents for the children they had accompanied or had been waiting to pick up, and friends for each other after groups were scattered by the blast. Twitter and Facebook were filled with appeals for the missing.

There was no immediate claim of responsibility for the bombing, which took place at the end of the concert when the audience was streaming toward the exits. Witnesses said they saw bolts and other bits of metal, indicating the bomb may have contained shrapnel intended to maximize injuries.

(The Associated Press)