• More details emerged about the Manchester bombing.

Salman Abedi, the 22-year-old who died during his attack on Monday that killed 22 people, was a soccer fan who smoked pot and had recently dropped out of school. Last month, he went to Libya to see his parents, and may have visited Syria.

The British police are hunting for what they called his “network.” Four men were arrested on Wednesday, including Mr. Abedi’s older brother.

Preliminary evidence revealed that Mr. Abedi carried a powerful bomb in a metal container concealed either within a vest or backpack, and held a detonator in hand.