One question: What happened to all the reports in the days after the bombing that said these were NOT suicide bombs, but were on timers? What made them think that then? What made them change their minds now? Something smells funny.
they claim they have these videos, and I imagine they have some forensics from the point of the explosion.
the tin foil theory on this:
they have no idea who did it, they are clueless. its easiest to say "all the suspects blew themselves up". who is going to prove otherwise? they close the books on this incident quickly and move on, because they don't have the political courage to do what is needed to clean this scum off their streets. what's 52 dead in the big picture? not much.