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Collapse of the World Trade Center
On September 11, 2001, the two main towers of the World Trade Center complex were each hit by hijacked commercial aircraft as part of the September 11, 2001 attacks. 2 WTC collapsed to the ground at 9:59 am, less than an hour after being hit, and 1 WTC followed at 10:28 am, causing massive damage to the rest of the complex and nearby buildings.
Note: The above text is excerpted from the Wikipedia article "Collapse of the World Trade Center", which has been released under the GNU Free Documentation License.
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