Those look like t-72’s. If memory serves, the main battle gun’s ammo is stored in the rear. As another poster pointed out, one might have gone off in the breach prematurely. That could have definitely cooked off the rest (I don’t think the warhead is “armed” until spun out of the barrel, but it has been a while)
T72 usually has a smooth bore gun.
T72 usually has a smooth bore gun.