September 11, 2001 because of sabotage or 9/11 (nine one one) is the most serious terrorist operations in history. The suicide attack on harmonization four times the United States. In New York City and Washington DC on September 11, 2001 morning, 19 terrorists from the Islamist militant group Al-Qaeda. Four ships hijacked passenger aircraft Thieves hijack the aircraft crashed into the twin towers of the World Trade Center in New York City deliberate. Both buildings collapsed within two hours. A third plane hijacker hit the Pentagon building in Arlington. Virginia The fourth plane United Airlines Flight 93 crashed in a field near the Channel Link Knoxville. State of Pennsylvania, PA. Prior to reaching the target of thieves hijack a plane crash like the US Capitol building in Washington DC after a passenger tried to hold back. Nearly 3,000 people have died in such attacks. And there are no survivors from the plane, four ships.