Two health workers and two children were killed, many from the civilian branch of the governent were injured (which were blatantly categorized as Hizbullah fighters). Even if not a single civilian were killed or hurt, some of these pagers exploded in grocery stores and other public spaces effectively terrorizing and traumatizing the local population.

So yes, it was a terrorist attack. Recently, Israeli occupation in Gaza was added to the list of genocides in wikipedia, this should be added as a list of terrorist attacks in the middle east.