Britain deploys troops to prevent attacks after Manchester suicide bombing

Soldiers were deployed to key sites in Britain on May 24 to prevent possible attacks after the terror threat alert was raised to its highest level following a suicide bomb in Manchester that killed 22 people, including children.

Prime Minister Theresa May announced late on May 23 that the threat level was now considered "critical," meaning an attack may be imminent.

Police had earlier named British-born Salman Abedi, 22, as the perpetrator of the bombing at the Manchester Arena indoor venue at the end of a concert by U.S. pop singer Ariana Grande on May 21.

Some of the victims included an 8-year-old girl, two teenage girls and a 28-year-old man. A Polish couple who had come to collect their daughters after the concert also died, Poland's foreign minister said. The daughters were safe.

The bombing also left 59 people wounded, some with life-threatening injuries.

"Whilst some of what we are doing will be obvious to the public, there is a huge amount of work happening day and night that the public will never know about," said Cmdr. Jane Connors, who is leading the London policing operation.

Three men have been arrested in Manchester in an investigation into the attack.

"Three police warrants were executed in south Manchester in connection to the ongoing investigation," a spokeswoman for Greater Manchester Police said.

The attack was the deadliest in Britain since July 2005, when four British Muslim suicide bombers killed 52 people in coordinated attacks on London's transport network.

U.S. security sources, citing British intelligence officials, said Abedi was born in Manchester in 1994 to parents of Libyan origin.

British investigators were looking into whether Abedi had travelled...