The explosive where below where the plane hit .... they knew before hand where the plane would hit and planted the explosives to bring the towers down.
People do you actually believe 3 buildings with re-enforce steel that has been fireproof will completely collapse in 10-15 sec. It ain't gonna happen .... at best the building would come down gadually with a lot of twisted metal left standing ....
Never in history has this happen yet we are expected to believe these 3 build fell in seconds only after a few hours of burning? .... get real ...