Brig.Gen. Hidai Zilberman later told reporters that the explosion was due to the firing of an SA-5 surface to air missile that was fired towards Israel and that it exploded in the southern Negev.
The firing of the missile came during Israeli air strikes in the south of Syria. The missile was not directed towards any target, Zilberman said.
According to the spokesman, Israel responded to the firing of the SA-5 towards IAF jets by striking several anti aircraft batteries in Syria, including the one which fired the missile that exploded in southern Israel.
Thanks. None of that was in the story when I first posted it.