Federal Bureau of Investigation (FBI) agents, fire fighters, rescue workers and engineers work at the Pentagon crash site on Friday, September 14, 2001, where a hi-jacked American Airlines flight slammed into the building on September 11, 2001.  The terrorist attack caused extensive damage to the west face of the building and followed similar attacks on the twin towers of the World Trade Center in New York City.  .Credit: Department of Defense via CNP.
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