It was September 11, 2001 when terrorist attacked the United States, an ordinary day which became shocking and unforgettable, a day which turns into a sad story. A total of 19 terrorist hijacked four planes on 9/11. The two planes were flown into two sky scrapers of New York’s World Trade Center. The impact caused the building to catch fire and collapse. The other plane destroyed part of the Pentagon in Arlington, Virginia. The fourth plane crashed in Shanksville, Pennsylvania. Officials of United States believe that the terrorist on the plane intended to destroy the White House or the U.S. Capitol. Passengers on the plane fought the terrorist and prevented them from reaching their goal. In all, nearly 3,000 people died during the 911 attack.