Timeline of Attacks September 11, 2001 at 5:04 PM EST - Updated July 2 at 2:50 AM Plane crashes into tower of World Trade Center in lower Manhattan, shortly before 9 a.m. Eastern. Second plane crashes into the second tower of the World Trade Center, shortly after 9 a.m. Eastern. President Bush, in Sarasota, Florida, calls the crashes "an apparent terrorist attack" and a "national tragedy". An aircraft crashes near Pentagon, just outside of Washington D.C., in northern Virginia, about an hour after the attacks in New York. Government buildings in Washington, including the Capitol and the White House, are evacuated with officials citing a credible threat of a terrorist attack. The Federal Aviation Administration shuts down all aircraft takeoffs nationwide. Shortly after 10 a.m. Eastern, one World Trade Center tower in New York collapses. American Airlines says one of the planes that crashed into the Trade Center was American Airlines Flight 11, hijacked after takeoff from Boston en route to Los Angeles. Senior law enforcement officials say car bomb explodes outside of State Department in Washington, D.C. Federal protective services later denies car bomb attack occurred. Financial markets suspend trading in the wake of the attacks. Officials at Somerset County Airport say a large plane crashed in western Pennsylvania, about 80 miles southeast of Pittsburgh, at about 10:00 a.m. The second tower of the World Trade Center collapses at 10:28 a.m. Eastern. Fourth explosion rocks the collapsed remains of the World Trade Center, at about 10:38 a.m. Authorities across the country go on alert, tightening security at strategic facilities and evacuating high-profile buildings. U.S. monuments and museums in Washington D.C. close. Securities and Exchange Commission closes all U.S. financial markets. American Airlines confirms two planes, carrying a total of 156 people, are "lost". A high-ranking New York City police official says the number of people killed or injured could be in the thousands. Afghanistan's hard-line Taliban rulers condemn the attacks in New York and Washington, rejecting suggestions that Saudi dissident Osama bin Laden was behind them. Shortly after 1 p.m. Eastern, President Bush vows to do "whatever is necessary" to keep Americans safe, blaming "a faceless coward" for this morning's attacks.