Introduction

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On September 11, 2001, the three worst structural failures in modern history took place when World Trade Center Buildings 1, 2, and 7 suffered complete and rapid destruction. Also on that day the Pentagon, the most heavily defended building complex in the world, was struck by a Boeing 757 commercial airliner inflicting catastrophic damage.

In the aftermath of the tragedy, most members of the architecture and engineering community, as well as the general public, assumed that the buildings’ destruction had occurred as a result of the airplane impacts and fires. This view was reinforced by the 2005 and 2008 reports by the National Institute of Standards and Technology (NIST) regarding World Trade Center Buildings 1, 2, and 7. In 2002 the American Society of Civil Engineers (ASCE) published a review of the damage and structural performance of Pentagon on 9/11 in its Building Performance Report.

Since 9/11, however, independent researchers around the world have assembled a large body of evidence that overwhelmingly refutes the notion that airplane impacts and fires caused the destruction of the Twin Towers and WTC 7. In addition, reporters on the scene in New York documented eyewitness testimony of secondary explosions. This body of evidence, which FEMA and NIST omitted from their reports, supports the troubling conclusion that all three skyscrapers were destroyed in a process known as “controlled demolition,” where explosives and/or other devices are used to bring down a building.