Prelude 9/11 morning Flight 11 hijacked Flight 175 hijacked WTC 1 hit Flight 77 hijacked WTC 2 hit Flight 93 hijacked Pentagon hit WTC 2 collapses Flight 93 crashes WTC 1 collapses WTC 7 collapses Epilogue


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Investigation of WTC 7

NIST NCSTAR 1A: Final Report on the Collapse of World Trade Center Building 7

Full report (130 pages).

Download PDF

Download chapters

  • NIST NCSTAR 1-9: Structural Fire Response and Probable Collapse Sequence of World Trade Center Building 7 (two volumes)

WTC 7 Technical Briefing

Shyam Sunder, NIST, 26.08.2008


American Society of Civil Engineers (ASCE).

A peer-reviewed article on the collapse of WTC 7 was published in the Journal of Structural Engineering, Volume 138 Issue 1 – January 2012.


The Freedom of Information Act (FOIA) is a law requiring full or partial disclosure of previously unreleased information and documents controlled by the United States government by request.

In order to avoid sensitive data from being wrongfully released, a FOIA request must be presented before a judge.

NIST’s response to FOIA Request #10-037