The September 11 attacks happened in New York, New York.
A third plane , American Airlines Flight 77 , was crashed into the Pentagon -LRB- the headquarters of the United States Department of Defense -RRB- in Arlington County , Virginia , leading to a partial collapse of the building 's western side .	the Pentagon	the Pentagon	Flight 77	American Airlines Flight 77	United States	United States	American Airlines	American Airlines	American Airlines Flight 77	American Airlines Flight 77	United States Department of Defense	United States Department of Defense
