It's horrific to see this happen. I hope that people make it out of this ok, and they get to bottom of who did this. Seeing these kinds of senseless attacks on the innocent is just disgusting.
In addition one explosion could be accidental, two not so.
I am expressing my support to the victims of this tragedy and my disgust over an attack which was clearly ment to hurt and kill innocent people. If this discussion was about a similar attack anywhere else in the world by anyone I would have the same opinion of the attack. But it's not.