Do you think it is an inside job?
That was actually my first thought, which is depressing no matter how you look at it (says a lot about how America's going recently). I also wonder what freedoms will be taken from us NOW with this as an excuse.
Also, that a young child was killed makes me fucking sick. I hope the media focuses more on that and the victims, and frankly kind of hope they never identify the bomber even if their identity is known. Give other sick fucks who might have the same bright idea the notion that they won't get famous or make a point this way, and (on the optimistic hope that this might actually mean something to *some* would-be bombers/terrorists) remind them that the lives they take could be those of little kids.