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September 11th
On the morning of September 11, 2001, four American airliners were hijacked by nineteen men armed with box cutters and knives. Two airplanes were crashed into the World Trade Center, one into the Pentagon and the last crashed 80 miles southeast of Pittsburgh.

en.wikipedia.org/wiki/Collapse_of_the_World_Trade_Center

... walls of the collapsed North Tower struck the ground 11 seconds after the collapse started, ...

.ask.com/youtube?q=Twin+Towers+Falling&v=ft2uIYucsXo
Sep 8, 2011 ... September 11th, 2001 - WTC Collapse ... ... September 11, 2001 attack - the towers fall. ..... Exactly 15 years ago the South Tower collapsed. .... This Computer Simulation Explains How the Twin Towers Fell - Duration: 4:01.

time.com/4453467/911-september-11-falling-man-photo

Sep 8, 2016 ... Most images from 9/11 are of towers, not people. Falling ... The Story Behind the Haunting 9/11 Photo of a Man Falling From the Twin Towers.

www.tms.org/pubs/journals/jom/0112/eagar/eagar-0112.html

The collapse of the World Trade Center (WTC) towers on September 11, 2001, was ..... Steven Ashley, “When the Twin Towers Fell,” Scientific American Online ...

www.express.co.uk/news/world/709440/who-was-falling-man-9-11-september-11-attack-twin-tower-15-year-anniversary

Sep 11, 2016 ... Mystery surrounds the victim of Twin Towers terror attack ... GETTY. The falling man's identity remains a mystery 15 years after the 9/11 attacks.

www.thoughtco.com/why-world-trade-center-towers-fell-177706

May 22, 2017 ... But, the impact of the planes and the burst of flames did not make the Towers collapse right away. Like most buildings, the Twin Towers had ...

www.thesun.co.uk/living/1744185/wacky-conspiracy-theorists-believe-this-video-is-proof-the-twin-towers-were-brought-down-by-a-controlled-explosion

Sep 8, 2016 ... According to these far-fetched claims, the only explanation for the vertical collapse of the Twin Towers can be that they were destroyed by a ...

sonichu.com/cwcki/Twin_Falling_Towers

Jan 29, 2017 ... Twin Falling Towers is a video uploaded by Chris on 1 November 2009. An unusually tasteless video even for his standards, here, Chris ...

www.history.com/topics/9-11-attacks/videos/how-the-towers-collapsed

A brief explanation of why the towers collapsed on 9/11.