ask any fire fighter about this and get some answers from informed sources.But video we have argues against the big explosion. Although I will inform you that concrete and steel buckling under pressure can make horribly loud thunder like booms. The dust kicked up combioned with such an effect, and the remaing burning fires would give the impression of an explosion. Even completely rational people would mistake it for one if they didn't see the source.
-Yes it can make a horribly loud thunder like booms.
But in wont make a sound (at least thunder like) until it starts to crumble.
buildings on fire can, and do, make booming noises, even when they aren't falling.