Notice premature detonations hurling debris out the windows, many stories below the collapse line .
Osama Bin Laden denies any involvement with 9/11, Sept. 28, 2001: http://www.globalresearch.ca/interview-with-osama-bin-laden-denies-his-involvement-in-9-11/24697
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https://www.youtube.com/watch?v=NPAjZvLa9c0