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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, ...

www.ask.com/youtube?q=Twin+Towers+Falling&v=ft2uIYucsXo
Sep 8, 2011 ... http://www.onemediacollective.com See the real unedited footage of how the towers went down with live audio of the city. September 11th ...
www.ask.com/youtube?q=Twin+Towers+Falling&v=8Mz0_x7313I
Apr 5, 2006 ... 9/11: North Tower Collapse (Etienne Sauret) - Duration: 3:12. Nathan Flach 820,316 views. 3:12. September 11th As It Happened: The ...

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 ... The towers were designed and built in the mid-1960s through the early 1970s. ..... Steven Ashley, “When the Twin Towers Fell,” Scientific American Online ...

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

Sep 7, 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.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 ... Engineers' footage compares the difference between buildings that collapse under a controlled explosion and those that don't.

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.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.

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 ...