TOP-SECRET -“FBI agents, fire fighters, rescue workers and engineers work at the Pentagon crash site,” 9/11/2001

“FBI agents, fire fighters, rescue workers and engineers work at the Pentagon crash site,” 9/11/2001; Photo number: 010914-F8006R-002; Photo Courtesy of the Department of Defense

On September 11, 2001, terrorists hijacked four passenger airliners, crashing them into the World Trade Center in New York City, and into the Pentagon in Arlington, Virginia, while the fourth plane crashed in a field in Pennsylvania. Shown here is the crash scene at the Pentagon following the attack.