Homicide bombers detonate multiple pipe bombs strapped to their body when they attack.
It looks like all of them didn't detonate at the same time. One blew up early and killed the perp as he was heading towards the stadium and the remaining pipe bombs were detonated by the authorities when they found his body.
Funny how they authorities are trying to spin this off as only a "pipe bomb suicide".
I know, I'm just saying that a "typical" suicidal American male would not attempt a "normal" suicide through a means as cumbersome and uncertain as a pipebomb. The fact that this person was killed by a pipebomb under these circumstances leads me to conclude that his intent was to inflict harm on others as well as himself. A suicide bomber, or a suicide bomber wannabe.