attack as a result of a bombing, the 77 bombing that killed 52 people in london, it took days for the police to identify the four bombers. this is a very, very early breakthrough, explained just a short time ago, by the police chief in manchester. let's take a listen. >> i can confirm that the man suspected of carrying out last night's atrocity is 22-year-old salman abedi. however, he has not yet been formally named by the coroner and i wouldn't wish to, therefore, comment further about him at this stage. our priority, along with the police counterterrorist network and our security partners, is to continue to establish whether he was acting alone or working as part of a wider network. >> reporter: so that is the key question. he either just detonated the bomb or he also made it. if he didn't make it, that means the bomb maker is still on the