This leaves three possible scenarios:
Yes, but look at the differences between this flight and those two bombings. Both of the undoubted bombings were apparently intended to be somewhat "public," so that there would be no doubt that a terrorist attack had occurred. (Air India 182 was apparently timed to explode at Heathrow, but there was a 1:40 delay on that flight.)
This crash was completely out of range of anybody -- and nobody has claimed responsibility. Unless there are further detailes, and/or a spate of similar events, I'd tend to rule out terrorism in this case.