According to architect Richard Gage, the Twin Towers and Building 7 were all brought down by controlled demolitions.

"Fires have never brought down a steel-framed high-rise building... ever."

"And what we have, unfortunately, is the evidence... of the ten key features of controlled demolition."

"The implications of a controlled demolition are dark for our country, because that means somebody besides Al-Qaeda was involved."

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It was a controlled demolition, but not with thermite, since the buildings were complete steel beam buildings. As incredible as this sounds, it was an underground thermo-nuclear explosion, which caused the buildings to crumble into dust due to the extremely high temperatures. This was the reason for the pyroclastic clouds and the upper part that was left going down in free fall. Moreover, you would have expected a huge heap of ruins after these buildings collapsed, but instead you had a blazing hot crater, where the nuclear device was positioned (about 50 meter under the buildings).