abc reporter ariel rashef with details. >> reporter: raise to root out possible suspects in the deadly bombing lasting into the night and through today. >> think it is clear this is a network we are investigating. as i said, it continues apace, this extensive investigation is going on and activity taking place across greater manchester as we speak. >> reporter: the primary focus, the neighborhood of suicide bomber 22-year-old salman abedi. abc news learned he was the son of libyan immigrants. the british home secretary saying he may have recently visited libya and syria. intelligence officials looking into possible connections with isis which praised the attack. police combing the center of manchester for clues as to who may have helped him develop the device that killed 2 people and injured more than 60 others. experts say the bomb contained nuts and bolts intended to maim and murder as many as possible. british police confirming they know the identities of all those who died outside the ariana grande concert. 18-year-old tweeting her excitement before the show. the mother of 15-year-