PENNSYLVANIA:
10:05 a.m. eastern standard time, a fourth hijacked airliner — United Airlines Flight 93 from Newark, N.J. to San Francisco, a Boeing 757 with 45 people aboard — crashes into a sparsely populated area of the countryside in Somerset County, Penn., to the southeast of Pittsburgh. There are no reports of survivors.
WASHINGTON:
9:45 a.m. eastern standard time, a third hijacked American Airlines airliner — believed to be Flight 77, a Boeing 757 bound from Washington Dulles Airport to Los Angeles with 64 passengers and crew aboard — crashes into the Pentagon
NEW YORK:
8:48 a.m. eastern standard time, a hijacked airliner crashes into the north tower of New York's World Trade Center.
9:04 a.m., as emergency crews rushed to help victims of the first crash, a second hijacked airliner crashes into the World Trade Center's south tower in an enormous fireball
Theodore Kaczynski, who acted under sobriquet Unibomber, is sentenced to life imprisonment for an 18-year campaign of parcel bombings. The attacks, which were part of an 'antimodernist' crusade, killed three people and injured 23.
A bomb explodes in Centenary Park in Atlanta during the Olympic Games, killing two people and injuring 110 others.
A train travelling between Miami and Los Angeles is derailed in Arrizona after a bomb explosion claimed by a hitherto unknown group calling themselves The sons of the Gestapo. One person was killed and more than 80 injured.
A truck bomb left outside a federal building in Oklahoma City kills 168 and injures more than 600 others.
One dead in an explosion in the washrooms at the World Trade center leaves six dead and 1,000 injured.
One dead in an explosion in the washrooms at Pan Am terminal at JFK airport. The bombing claimed by the Puerto Rican resistance army..
Eleven dead and 75 injured by a bomb planted in the left luggage department at La Guardia airport.
An explosion in a bar leaves four people dead. It is one of a series of 49 bombings between 1974 and 1977 attributed to the Puerto Rican National Liberation Army.
A researcher at a university in Madison is killed by a bomb planted by a pacifist group.