Mossad is the most funded and modernized intelligence agency in the world. (In fact, their evil puts the CIA to shame). There's no way they didn't know this was going to happen. It stinks to high heaven.
Discussion
Absolutely. Anyone who thinks Mossad A) wouldn’t know this was going to happen beforehand B) Israel isn’t thoroughly prepared for this sort of incident = completely clueless NPC. So 90% of the world.
Those "terrorists" are simply their version of the CIA's taliban/ISIS groups. Security institutions require a boogeyman for the people to not see they are the actuall terrorists.
Earlier in the day american-trained "terrorists" killed almost a hundred syrians, including several kids, but almost nobody in the west gives a shit about Syria.