This guy seems to be hinting, without saying it, that it was an actual atomic bomb. If not that, at least components for a bomb and/or weapons grade plutonium/uranium. What else could start WWIII? Methinks a dirty bomb would not be enough.
World War III ??? A World War is a catasrophic series of escalating events culminating in massive military mobilizations and subsequent death and destruction. If Syria/Iran were to set off a nuke device in Israel we would wipe their miniscule presence off the face of the earth in a matter of minutes...Game Over - would that be WW III?