A scientific study by 3,000 architects and engineers, finalized in March, 2020, disagrees with the official reason for the collapse of World Trade Center Building 7 (Salomon Building), 19 years ago on Sept. 11, 2001.
In 2008 the National Institute for Standards and Technology (NIST), an agency of the U.S. Department of Commerce, conluded that debris from the collapse World Trade Center Tower 1 ignited fires on at least 10 floors in WTC7.
Researchers at the University of Alaska Fairbanks (UAF) with the Architects & Engineers for 9/11 Truth challenged the fire hypothesis with their study and are requesting a correction to the official 2008 NIST report.
“The collapse of WTC 7 was a global failure involving the near-simultaneous failure of all columns in the building and not a progressive collapse involving the sequential failure of columns throughout the building.”UAF report
Some theorize a controlled demolition brought down WTC 7, citing the media reporting on the collapse before it happened, and disputed claims of a radio countdown heard prior to the collapse. The UFA report does not make such claims.
Strengthening the official fire collapse theory is that over 300 firefighters died when the twin towers fell, disrupting the ability to extinguish flames in WTC 7 which had sprinkler system failures. Also, could alleged demolition wiring survive eight hours of fires before alleged conspirators decided to push the detonate button?
Enhanced video and audio of the moment of collapse (below) provides no answers, but does show some areas collapsing before others.