The Latest on the Ariana Grande Concert Bombing in Manchester

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■ Nineteen people were killed and 59 others were injured in an explosion about 10:35 p.m. on Monday in the foyer outside the main hall of the Manchester Arena. ■ Prime Minister Theresa May said the police were treating the incident as “an appalling terrorist attack.” ■ The authorities suspect the blast came from either an abandoned backpack or a suicide bomber, a senior American intelligence official said. British officials said they were investigating reports that a suicide bomber detonated an improvised device containing nuts and bolts as shrapnel. ■ The explosion occurred just as a concert by the American pop star Ariana Grande was ending. Traumatized fans, including children, screamed and ran. Ms. Grande was not injured. ■ Parents who were separated from their children during the mayhem were told to go to nearby hotels, where many had taken refuge. Other children were being kept in the arena. Continue reading the main story ■ The police carried out a controlled explosion near the arena but later said the suspicious material was harmless. Bomb squads continued to comb through downtown Manchester. ‘Everyone Started Crying and Screaming’ Laura Bruce, 18, was with her sister Amy, 25, in one of the arena’s upper tiers when they heard the explosion. “Everyone below us just turned and ran,” she said. “Because we were higher up, we could not get out for five minutes. When we came out, a man walked past us just covered in blood.” Sophie Tedd, 25, had traveled from Darlington to attend the concert with her friend, Jessica Holmes. At the end of the concert, they heard a loud bang and initially wondered whether “a speaker had blown.”

“Then everyone started crying and screaming,”

she said. “Everyone ran out. People were pushing each other out of the way. It took a couple of minutes to get out. The police were outside, telling us to keep running, to run away from Victoria station.” Video from inside the arena showed the surreal scene of patrons scrambling for the exits, covered in pink balloons. The balloons were part of the choreographed staging for Ms. Grande’s tour, after a segment with projections and lasers.