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MANCHESTER, England (AP) — As officials hunted for accomplices of a suicide bomber and Britain’s prime minister warned another attack could be “imminent,” thousands of people poured into the streets of Manchester in a defiant vigil Tuesday for victims of a blast at a pop concert — the latest apparent target of Islamic extremists seeking to rattle life in the West.

The attack left at least 22 dead, including an 8-year-old girl, shattering the revelry at a show by American singer Ariana Grande, where strains of electric pop and the sways of innocent young fans quickly gave way to an explosion, a flood of screams and a stampede of panicked concert-goers, many clutching pink balloons and wearing the kitten-ear headbands popularized by Grande.

Touching on that disconnect, British Prime Minister Theresa May 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.”

May said Britain’s terror threat level had been raised to critical — meaning another attack may be imminent. The status means armed soldiers could be deployed instead of police at public events including sports matches. The threat level had been at the second-highest rung of “severe” for several years.

The Islamic State group claimed responsibility for the blood bath Monday, though a top American intelligence official said the assertion could not be verified. Manchester Police Chief Ian Hopkins identified the bomber as 22-year-old Salman Abedi, who authorities said died in the attack. Police raided two sites in the northern English city, setting off a controlled explosion in one, and arresting a 23-year-old man in a third location.

May said Abedi was born and raised in Britain and a European security official said he was of Libyan descent. The official spoke on condition of anonymity because he was not authorized to comment on ongoing investigations.

At least 20 heavily armed, helmeted police surrounded a modest red brick house listed as Abedi’s address in a mixed Manchester suburb at midday on Tuesday and blasted down the door.

“It was so quick. These cars just pulled up and all these police with guns, dogs, jumped out of the car and said to us: ‘Get in the house now,’” said Simon Turner, 46, who lives nearby. Later, forensic officers in white coveralls were seen going in and out of the property.

Details on Abedi were slow to trickle out. He was described by neighbors as a tall, thin young man who often wore traditional Islamic dress, but few said they knew him well.