Very hard to establish because of it being dark and the footage of the initial explosion in mid air is quite a distance away. When the camera concentrates on the fire on the ground and zooms in, it appears to be a fuel fed fire, bit like a ruptured fuel line or perhaps an underground oil pipe fire after being ruptured. Maybe it’s the fuel sources within the building but fuel and power supplies are said to be diminished or even in places cut off in Gaza. Whatever the truth is it’s a fact that both sides are well versed in propoganda and it’s a fact that deaths are accelerating up to 5000 in 11 days because of this conflict and no signs of it ending anytime soon. The innocents dying are not launching rockets or dropping bombs.