On Tuesday morning, September 11, 2001, the U.S. is attacked by terroristsin New York City and Washington, and the world changes forever.Sept. 11: Hijacked jetliners hit the World Trade Center in New York and the Pentagon outsideWashington. A fourth hijacked plane crashes into a field in Pennsylvania. Trading on WallStreet is stopped. The Federal Aviation Administration halts all flight operations at the nation'sairports for the first time in U.S. history. U.S. military is placed on high alert. President Bushaddresses the nation and vows to "find those responsible and bring them to justice." Hundredsof New York City firemen and policemen sent to rescue WTC workers are lost when the WTCTwin Towers collapse. Reaction from international leaders is swift as world leaders react withoutrage over the attacks. Go to Attack Images/Morning Timeline. Go to Bush Images/Timeline.