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en waarom staat er op wikipedia dit:
At 5:20 p.m. EDT on
September 11,
2001, 7 World Trade Center collapsed. Since it had been evacuated, there were no casualties.
In May 2002, the
Federal Emergency Management Agency of the United States (FEMA) released a report on the collapse.
[3] FEMA made preliminary findings that collapse was due primarily to fires on multiple stories caused by debris from the other two towers, and not to the actual impact damage of 1 WTC and 2 WTC as they collapsed. The report noted that, prior to this collapse, there was no record of the fire-induced collapse of a large fire-protected steel building such as 7 WTC. The report did not reach final conclusions, and outlined a number of issues that needed to be explored with respect to the cause of the collapse. Specifically, FEMA made these findings:
“Loss of structural integrity was likely a result of weakening caused by fires on the 5th to 7th floors. The specifics of the fires in WTC 7 and how they caused the building to collapse remain unknown at this time. Although the total diesel fuel on the premises contained massive potential energy, the best hypothesis has only a low probability of occurrence. Further research, investigation, and analyses are needed to resolve this issue.” (Chapter 5, pg 31.)
On
July 22,
2004, the
9/11 Commission Report was released, but made no mention of 7 World Trade Center.
In response to FEMA's concerns, the Commerce Department’s
National Institute of Standards and Technology (NIST) has conducted a three-year, $24 million investigation into the structural failure and progressive collapse of several WTC complex structures, including 7 World Trade Center. The study included not only in-house technical expertise but also drew upon the knowledge of several outside private institutions, including the Structural Engineering Institute of the
American Society of Civil Engineers (SEI/ASCE), the
Society of Fire Protection Engineers (SFPE), the
National Fire Protection Association (NFPA), the
American Institute of Steel Construction (AISC), the
Council on Tall Buildings and Urban Habitat (CTBUH), and the
Structural Engineers Association of New York (SEAoNY).
On
April 5,
2005, NIST released its report on 1 WTC and 2 WTC.
[4] On
June 20,
2005, NIST asserted in a press release that its report on 7 World Trade Center would be released "at a later date."
[5]
Despite FEMA's preliminary finding that fire caused the collapse, some individuals and groups have presented alternate viewpoints and theories, usually as part of a larger belief in a 9/11 conspiracy.
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