American Airlines Flight 11 crashes into One World Trade Center, the north tower.
United Airlines Flight 175 crashes into Two World Trade Center, the south tower.
American Airlines Flight 77 crashes into the west side of the Pentagon.
Two World Trade Center, the south tower, collapses.
United Airlines Flight 93 crashes in Somerset County, Pa.
One World Trade Center, the north tower, collapses.
Sept. 12, 2001
President Bush calls the Sept. 11 attacks "acts of war." The president asks Congress for $20 billion in aid.
Sept. 13, 2001
U.S. airports are reopened. Reagan National in Washington and Logan International in Boston remain closed for security reasons.
Secretary of State Colin L. Powell names Osama bin Laden as a prime suspect in the attacks. He is the first person from the Bush administration to do so.
Sept. 14, 2001
The Department of Justice releases the names of the 19 hijackers. Seven of the hijackers were trained airplane pilots.
Congress unanimously approves $40 billion in aid -- twice what Bush requested.
Sept. 15, 2001
Major U.S. airlines begin announcing layoffs, reducing flight schedules, and warning of possible bankruptcies.
Sept. 17, 2001
U.S. stock markets reopen. The Dow Jones Industrial Average experiences its largest points drop ever: 684.81.
US Airways announces that it will cut 11,000 jobs.
Sept. 19, 2001
The Department of Defense orders the deployment of combat aircraft to the Persian Gulf.
Sept. 20, 2001
Bush addresses Congress and the nation, declaring "a war on terror." This is a global war calling for the elimination of every terrorist group in the world. "Either you are with us or you are with the terrorists."
Sept. 21, 2001
The Taliban refuse Bush's ultimatum to hand over bin Laden.
Sept. 22, 2001
Bush signs a $15 billion bailout package for U.S. airlines.
Sept. 24, 2001
Bush issues an executive order freezing the assets of 27 groups and people suspected of supporting terrorism.
Sept. 29, 2001
The Department of Defense puts 3,427 members of the National Guard and Reserves on active duty.
Oct. 2, 2001
U.S. has proof that bin Laden was behind the Sept. 11 attacks, says NATO.
Oct. 5, 2001
A 63-year-old Florida man dies from anthrax.
Oct. 7, 2001
United States begins military strikes against Afghanistan.
Al-Jazeera, the Arabic language cable network, broadcasts a videotape of bin Laden praising the Sept. 11 attacks and calling all Muslims to go to war against the United States.
Oct. 10, 2001
Bush unveils the 22 most wanted terrorists at FBI headquarters. The list includes bin Laden and 21 others linked to terrorism over the past 16 years.
Oct. 15, 2001
A letter containing anthrax spores is received at Sen. Tom Daschle's office in the Hart Building.
Oct. 17, 2001
All six Senate and House office buildings are closed for testing. The House suspends work for five days.
Oct. 19, 2001
Traces of anthrax are found at the Brentwood mail center in Washington.
Nov. 9, 2001
Mazar-e Sharif falls to the Northern Alliance.
Nov. 13, 2001
Northern Alliance captures Kabul.
Bush signs an order authorizing the use of military tribunals to try those accused of terrorism against the United States.
Nov. 25, 2001
U.S. Marines land near Kandahar.
Kunduz surrenders to the Northern Alliance.
Dec. 2, 2001
The Pentagon confirms that Taliban fighter John Walker Lindh is an American citizen and has been taken into custody.
Dec. 5, 2001
Afghanistan's four main political factions agree on an interim government.
Dec. 6, 2001
The Taliban surrender Kandahar.
Dec. 12, 2001
A federal grand jury indicts Zacarias Moussaoui as a co-conspirator in the Sept. 11 attacks.
Dec. 22, 2001
Passengers and crew stop Richard C. Reid from detonating explosives in his shoes aboard a flight from Paris to Miami.
Jan. 4, 2002
Sgt. Nathan Chapman is the first U.S. soldier killed in hostile fire since the war began.
Jan. 9, 2002
A Marine Corps KC-130 tanker plane crashes into a mountainside in Pakistan, killing all seven aboard.
Jan. 15, 2002
Lindh charged with conspiring to kill U.S. citizens and supporting terrorist groups.
Jan. 20, 2002
Staff Sgt. Walter F. Cohee III from Mardela Springs, Md., is one of two Marines killed when a helicopter crashes into a mountain in Afghanistan.
Jan. 29, 2002
During his State of the Union address, Bush labels Iran, Iraq and North Korea an "axis of evil."
April 30, 2002
BWI becomes the first U.S. airport to be staffed with federally trained baggage screeners.
May 30, 2002
A ceremony at Ground Zero marks the end of the cleanup.
June 13, 2002
The loya jirga elects Hamid Karzai as leader of the transitional government.
June 24, 2002
A Jordanian man who roomed with two of the hijackers is taken into custody from a home in Baltimore's Highlandtown neighborhood.
July 1, 2002
A U.S. bomb hits an Afghan wedding party, killing 40 and wounding 100 more.
July 6, 2002
Afghan Vice President Haji Abdul Qadir is assassinated.
July 15, 2002
Lindh pleads guilty to two felony charges: providing services to the Taliban and carrying explosives while in service to the Taliban.
July 25, 2002
Moussaoui withdraws guilty plea. Jury selection for his trial to begin Sept. 30.
July 31, 2002
The Senate Foreign Relations Committee begins hearings on plans to attack Iraq.
Aug. 2, 2002
A federal judge orders the Justice Department to release the names of those detained after Sept. 11.
Aug. 5, 2002
Maryland, Virginia and D.C. leaders sign the first-ever homeland security pact.
Aug. 11, 2002
US Airways files for bankruptcy protection.
Steven Hatfill issues a statement denying any involvement in the anthrax attacks, which killed five people.
Aug. 15, 2002
Workers begin to return to the rebuilt Pentagon offices.
Sept. 4, 2002
Bush issues a proclamation stating that Sept. 11, 2002, will be called Patriot Day.
Sept. 11, 2002
In ceremonies across the nation, America honors the dead and ponders its place in a changed world.