A group Architects and Engineers for 9/11 Truth offered evidence "that all three WTC skyscrapers on September 11, 2001, in NYC were destroyed by explosive controlled demolition."
The third building the group referred to was World Trade Center 7, a skyscraper that collapsed about eight hours after the main WTC towers fell. For many 9/11 "truthers," WTC7's collapse despite not being hit by a plane is the "smoking gun" proving that something other than airplanes brought down the towers. The WTC7 collapse was not addressed in the official 9/11 Commission report.
Mossad "dancers on the roof" video-taping atttack...
On its Web site, the architects' and engineers' group lists facts that suggest explosives were used to take down the towers.
-- Rapid onset of "collapse"
-- Sounds of explosions at ground floor - a second before the building's destruction
-- Symmetrical "structural failure" -- through the path of greatest resistance -- at free-fall acceleration
-- Massive volume of expanding pyroclastic dust clouds
-- Expert corroboration from the top European Controlled Demolition professional
-- FEMA finds rapid oxidation and intergranular melting on structural steel samples
WTC7 exhibited none of the characteristics of destruction by fire, i.e.
-- Slow onset with large visible deformations
-- Asymmetrical collapse which follows the path of least resistance (laws of conservation of momentum would cause a falling, to the side most damaged by the fires)
-- High-rise buildings with much larger, hotter, and longer lasting fires have never "collapsed".
MORE: http://www.rawstory.com/rs/2010/09/senator-engineers-911-controlled-demolitions/