Dauly Mail, 2 November 2011 ts dramatic collapse several hours after the Twin Towers fell triggered a decade of conspiracy theories. Those who believed that the September 11 attacks on America were not carried out by Al Qaeda terrorists pointed to the fall of World Trade Center Building 7 as proof of their wild claims. But a newly released video appears to finally prove once and for all that Building 7 was brought down by the intense heat of the blazing World Trade Center - and not explosives, as conspiracy theorists claim.