September 11 · source record · webpage

NIST WTC 7 Investigation Finds Building Fires Caused Collapse

National Institute of Standards and Technology · 2008

AI-verified citationSRC-NIST-NEWS-2008

identifier / locator: News release, August 21, 2008 (announcing the DRAFT report for public comment)
url: https://www.nist.gov/news-events/news/2008/08/nist-wtc-7-investigation-finds-building-fires-caused-collapse
verification note: Fetched live 2026-08-26; lead investigator quotations and the blast-sound statement verified verbatim.
reliability notes: This release announced the draft report for comment, not the November 2008 final report — a distinction lost in most citation of it.
Its phrasing of the 'first known instance' finding differs slightly from the final report's; the report wording is preferred wherever the two diverge.

Evidence drawn from this source