News release: “The fall of the 47-story World Trade Center building 7 (WTC 7) in New York City late in the afternoon of Sept. 11, 2001, was primarily due to fires, the Commerce Department’s National Institute of Standards and Technology (NIST) announced today following an extensive, three-year scientific and technical building and fire safety investigation. This was the first known instance of fire causing the total collapse of a tall building, the agency stated as it released for public comment its WTC investigation report and 13 recommendations for improving building and fire safety.”

• Questions and Answers about the NIST WTC 7 Investigation
• Opening Statement Press Briefing, August 21, 2008, Report on the Collapse of World Trade Center Building 7
• NIST Response to the World Trade Center Investigation Disaster Presentation, Dr. S. Shyam Sunder, Director and Lead Investigator, Building and Fire Research Laboratory, NIST
• NIST NCSTAR 1A, Final Report on the Collapse of World Trade Center Building 7
  NIST NCSTAR 1-9, Structural Fire Response and Probable Collapse Sequence of World Trade Center Building 7
  • Volume 1: Chapters 1 through 8
  • Volume 2: Chapters 9 through 14 and Appendixes A through E
• NIST NCSTAR 1-9A, Global Structural Analysis of the Response of World Trade Center Building 7 to Fires and Debris Impact Damage
• Video: The Collapse of World Trade Center 7: Why the Building Fell
• Related postings on 9/11