Correct, there were many fire fighters who testified that they heard multiple explosions in successions before the buildings collapsed. We even see it in the video on building 7 which was Controlled demolition. Do not believe shills, like Fire fighters had nothing better to do after 3k people were buried under miles of steel and concrete except to go quickly rig another building that had no visible damage of falling debris over a 1/4 mile away, just so that they could give Larry Silverstein the choice of saying "Pull it" or not. These people are stupid and they think they are smarta than us; that is how stupid they are.