If you are looking for proof that Building 7,a 47 level building within the WTC compound was brought down other than fire watch to the end of this vid. Remember that no other building in the history of modern reinforced concrete & steel buildings has been brought down by Fire alone - look up Madrid 2005 Windsor Building a blaze that burned all night and threatened to bring down the 32-story skyscraper.Amazingly, a construction crane remained perched on the roof - See this link for more on this:
http://whatreallyhappened.com/WRHARTICLES/spain_fire_2005.html
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