The head-in-the-sand, we-parrot-the-government-line crowd is all over one of the other threads on this, declaring it was just an "isolated incident" by a "lone nutcase", and not terrorism. Forget the timing, forget the guy's background.
If the government had said nothing at all, one way or the other, before a thorough investigation, that would be one thing. Now, I believe it is almost certainly terrorism, simply because of the government's rush to declare it not so.