. >> reporter: bethany keeling was right near the exit when the bomb went off. >> i saw like a flash.ike, an explosion flash. i grabbed my friend's hand and we just ran. but we looked and we could see the bodies on the floor. >> reporter: victims lying where they'd fallen. the ground streaked with blood. the killer today identified as 22-year old british-born salman abedi. police believe he detonated his suicide bomb here, in an area connecting the massive arena to the nearby train station, which then descended into chaos. when the bomb went off, many parents were waiting outside to collect their kids after the show. for some of to youngsters, it was their first concert. joe gregory was sitting in his car, waiting to pick up his girlfriend. he sees the flash, hears the bang. and then it hits him. >> no! >> reporter: as ambulances screeched to the scene, and people tended to the wounded, nick hayward plunged into the fleeing crowd, searching for his daughter kaitlyn. >> i had that moment when i was working my way up the steps of, "what am i going to find?" and in the back of your mind,