9:03am: A second hijacked airliner, United Airlines Flight 175 from Boston, crashes into the South Tower of the World Trade Center and explodes. The South Tower caught on fire.
9:10am: President Bush Is in Florida reading to children in a classroom. This is when he learned of the attack.
9:17am: The Federal Aviation Shut down all New York City airports.
9:20am: The FBI investigates reports of planes being hijacked.
9:21am: The Port Authority of New York and New Jersey orders all bridges and tunnels in the New York area closed.
9:30am: President Bush, Speaking in Sarasota, Florida says the country suffered an "apparent terrorist attack."
9:40am: The FAA halts all flight operations at U.S. airports. This is the first time in United States history air traffic all over the United States has been haulted.
9:43am: American Airlines Flight 77 crashes into the Pentagon.
9:57am: The White House evacuates.
10:05am: The South Tower of the World Trade Center collapses.
10:08am: Secret Service agents armed with automatic rifles are deployed into lafayette Park across from the White House.
10:10am United Airlines Flight 93, also hijacked, crashes into Somerset County, Pennsylvania.
10:13am: The United Nations building evacuates, including 4,700 people from the headquarters building and 7,000 total from UNICEF and U>N> development programs.
10:28am: The World Trade Center's North Tower collapses.
10:45am: All Federal office buildings in Washington evacuated.
10:46am: U.S. Secretary of State Colin Powell cuts short his trip to Latin America to return to the United States.
10:48am: Police confirm the plane crash in Pennsylvania.
10:53am: new York's primary elections, scheduled Tuesday, are postponed.
10:54am: Isreal evacuates all diplomatic missions.
10:57am: New York Governor George Pataki says all state Government offices are closed.