Police on Tuesday identified the man who blew himself up the previous night at an Ariana Grande concert in Manchester, England, as 22-year-old Salman Abedi. CBS News confirmed Abedi was known to British authorities prior to the attack.

An unnamed European security official told The Associated Press that Abedi was a Briton of Libyan descent. ISIS has claimed responsibility for the attack.

Officials said one man was arrested Tuesday in southern Manchester in connection with the attack, and urged people to avoid the center of the city as raids continued at addresses around the city.

Police and British Prime Minister Theresa May made it clear the focus of the investigation was to determine whether the bomber "was acting alone, or was part of a wider group."

Manchester police confirmed the arrest of a 23-year-old man in the southern Chorlton neighborhood of the city on Tuesday morning. The suspect taken into custody was not identified, but police said the arrest was linked to the bombing. Witnesses said the man was smiling as he was apprehended.

Police also confirmed that officers had conducted a controlled explosion at the scene of a separate raid connected to the arena attack in the Fallowfield neighborhood, in south Manchester. Abedi reported lived at the residence.

There was security at the concert, but the bomber apparently didn't try to get into the venue, instead blowing himself up in an entrance foyer area as concertgoers flooded out of the arena.

The bomb wielded by Abedi was designed to kill and maim as many people as possible; many of the survivors suffered shrapnel wounds and ball bearings were found at the scene.