NEW YORK (Courtesy of CNN) -- Terrorists struck the United States Tuesday morning in harrowing, widespread attacks that included at least three commercial jet crashes into significant buildings.
In the first attack, a plane hit the north tower of the World Trade Center in Manhattan shortly before 9 a.m., followed by another plane into the second tower about 20 minutes later. Both towers later collapsed.
About an hour later, a plane crashed into the Pentagon, part of which later collapsed.
American Airlines told CNN that it lost two planes in "tragic accidents:" Flight 11 from Boston with 81 passengers and 11 crew aboard and Flight 77 from Washington Dulles airport with 58 passengers and six crew aboard. Both planes were en route to Los Angeles
United Airlines Flight 93 airliner headed from Newark, New Jersey, to San Francisco, crashed near Somerset, Pennsylvania -- police said initial reports indicated no survivors. It was not known if this was connected to the attacks. United also said it was "deeply concerned" about Flight l75 from Boston to Los Angeles.
The Pentagon, the White House, the State Department, the Justice Department, the Capitol, the CIA and all other government buildings in Washington evacuated.
In the first ever national ground stop of aircraft, all flights nationwide have been stopped at their departure airports.
All international flights were diverted to Canada.
Israel has evacuated all its missions around the world.
President Bush cancelled an appearance in Florida to return to Washington, calling the crashes "apparent terrorist attacks" and "a national tragedy."
In Chicago, the Sears Tower was evacuated; United Nations in New York evacuated.
The Centers for Disease Control and Prevention in Atlanta was evacuated. CDC was preparing bioterrorism teams in case they become necessary.
The New York Port Authority said it had closed all bridges and tunnels into the city.
New York's Bellevue Hospital was designated command central for handling the catastrophe. Several hospitals have already reported receiving victims with burns and head injuries.
U.S. stock markets were closed after the New York attacks.