Look at this site.....there's a LOT there, you'll have to read for awhile. It has quotes from people on the scene, including firefighters. It explains in detail how & why WTC7 fell and what was said & what was MEANT by what was said...and who decided...and why WTC7 was different from 5&6...etc..etc...


...and read this...

""NIST has released video and still-photo analysis of Building 7 before its collapse that appears to indicate a greater degree of structural damage from falling debris than originally assumed by FEMA. Specifically, the NIST's interim report on 7 WTC displays photographs of the southwest façade of the building that show it to have significant damage. The NIST interim report on 7 WTC details a 10-story gash that existed on the south façade, extending a third of the way across the face of the building and approximately a quarter of the way into the interior, but does not provide any photographs of the damage to the south façade.[1] A unique aspect of the design of 7 WTC was that each outer structural column was responsible for supporting 2,000 square feet (186 square meters) of floor space, suggesting that the simultaneous removal of a number of columns would severely compromise the structure's integrity. Consistent with this theory, news footage shows visible cracking and bowing of the building's east wall immediately before the collapse, which began at the penthouse floors.[1]

NIST "anticipated that a draft report will be released by early 2007".[9][10] NIST released a progress report in June 2004, outlining its working hypothesis, which was that a local failure in a critical column, caused by damage from either fire or falling debris from the collapses of the two towers, progressed first vertically and then horizontally to result in "a disproportionate collapse of the entire structure".[11][12] In a New York magazine interview in March 2006, Dr S. Shyam Sunder, NIST's lead WTC disaster investigator, said, of 7 World Trade Center, "We are studying the horizontal movement east to west, internal to the structure, on the fifth to seventh floors"; he added "But truthfully, I don't really know. We've had trouble getting a handle on Building No. 7".[13]

Despite FEMA's preliminary finding that fire caused the collapse, conspiracy theorists believe the collapse was the result of a controlled demolition. When asked about controlled demolition theories, Dr. Sunder said, "We consulted 80 public-sector experts and 125 private-sector experts. It is a Who's Who of experts. People look for other solutions. As scientists, we can't worry about that. Facts are facts."[14] In answer to the question of whether "a controlled[-]demolition hypothesis is being considered to explain the collapse", NIST said that, "[w]hile NIST has found no evidence of a blast or controlled demolition event, it would like to determine the magnitude of hypothetical blast scenarios that could have led to the structural failure of one or more critical elements."[10]"