^ Or possibly some wahhabis saw a chance to kill some heretics, and never being ones to miss out on such a chance, took it with aplomb. We dont know what happened for sure, but taking tariq hashimis word for it is like asking Gary Glitter if he touches kids for kicks. "Who, me guv? It was da shias wot made me do it" By the way this wasnt a sunni gunman shooting randomly back and killing a few civilians. This was snipers set up in position targetting people. No one responds to an alleged ambush by militiamen with snipers, you come out your house, all guns blazing. This had to be planned.