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Historical allegation
9/11 controlled-demolitionAtlas
Historical Events · Wars & war pretexts
Competing accounts of whether World Trade Center buildings collapsed from aircraft impact and fires alone, or with assistance from demolition charges, including separate focus on WTC 7.
Open the caseNational Institute of Standards and Technology5
- Official · NIST analyzed hypothetical blast scenarios for World Trade Center Building 7 across phases covering collapse initiation, blast-wave propagation inside the building, and window response.
- Official · NIST has publicly described its World Trade Center investigation as leaving a lasting legacy for building and fire safety practice.
- Documented · NIST issued multi-volume World Trade Center investigation reports covering emergency response operations and the structural fire response and probable collapse sequence of World Trade Center Building 7.
- Official · NIST published NCSTAR 1 on the Twin Towers in 2005 and NCSTAR 1A on WTC 7 in 2008.
- Official · NIST stated that decisions not to fight the fires in World Trade Center Building 7 and to turn off power to the Con Edison substation were reasonable and would not have changed the outcome that day.
World Trade Center4
- Documented · Academic writing on American conspiracy culture treats controlled-demolition claims about the World Trade Center as a premise that some authors link to broader alleged government-insider narratives.
- Documented · Hijacked aircraft struck WTC 1 and WTC 2 on 11 September 2001; both towers collapsed the same day.
- Documented · World Trade Center Building 7 collapsed on the afternoon of 11 September 2001 without being struck by an aircraft.
- Contested · Advocacy films and archives promote the claim that explosives or controlled demolition, rather than impact and fire alone, brought down World Trade Center buildings.
National Commission on Terrorist Attacks Upon the United States3
- Official · The National Commission on Terrorist Attacks Upon the United States issued its public report in July 2004.
- Documented · The National Commission on Terrorist Attacks Upon the United States was established in the legislative branch as an independent bipartisan commission and later ceased operations as a temporary federal entity.
- Documented · The public website of the National Commission on Terrorist Attacks Upon the United States was frozen and retained as a federal record managed on behalf of the National Archives and Records Administration.