Images of 9/11 the US will never forget

New York City: Twenty years ago, two hijacked planes struck the World Trade Center, killing thousands and forever changing the lives of countless Americans.

The second hijacked plane is seen as it hits the second tower of the World Trade Center on Sept. 11, 2001. (Masatomo Kuriya/Corbis via Getty Images)
The second hijacked plane is seen as it hits the second tower of the World Trade Center on Sept. 11, 2001. (Masatomo Kuriya/Corbis via Getty Images)
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