There were reports though, of as the building collapsed, I can't remember the names for them, but those puffs of smoke that belched out the windows. People say that those puffs of smoke is the sign of an explosive, because those puffs of smoke, or dust, comes out of windows of buildings when they are torn down on purpose. but I think the logical explanation of those dust puffs is simply the air pressure inside the building when it fell and all of the dust is being pushed out of the windows.
