On Sept. 11, 2001, terrorists took the lives of nearly 3,000 people on American soil.
The Pentagon, headquarters for the Defense Department, was attacked that day. American Airlines Flight 77 flew into the west wall of the building's first floor, setting off a chain of events that killed 125 people inside — most of whom were Army and Navy service members and employees — along with the 64 people on board the Boeing 757.
There are iconic photos from that day that will remain seared in the minds of many forever. Here are some photos that show the devastation at the Pentagon:
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