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The following timeline is a chronological list of all the major events leading up to, during, and immediately following the September 11 attacks against the United States in 2001, through the first anniversary of the attacks in 2002.
All times are in local time (EDT or UTC − 4).
Al-Qaeda is a Sunni pan-Islamist militant organization led by Salafi jihadists who self-identify as a vanguard spearheading a global Islamist revolution to unite the Muslim world under a supra-national Islamic state known as the Caliphate. Its members are mostly composed of Arabs, but also include other peoples. Al-Qaeda has mounted attacks on civilian and military targets in various countries, including the 1998 United States embassy bombings and the September 11 attacks; it has been designated as a terrorist group by the United Nations Security Council, the North Atlantic Treaty Organization (NATO), the European Union, and various countries around the world.
Khalid Muhammad Abdallah al-Mihdhar was a Saudi Arabian terrorist hijacker. He was one of the five hijackers of American Airlines Flight 77, which was flown into the Pentagon as part of the September 11 attacks.
Nawaf Muhammed Salim al-Hazmi was a Saudi Arabian terrorist. He was one of five hijackers of American Airlines Flight 77, which they crashed into the Pentagon as part of the September 11 attacks in the United States.
Osama bin Mohammed bin Awad bin Laden, also known as Usama bin Laden, Usamah bin-Muhammad Bin-Ladin, Shaykh Usama Bin-Ladin, Abu Abdullah, Abdul Hay, Mujahid Shaykh, and Hajj, was a Saudi Arabian-born militant and founder of the pan-Islamic militant organization Al-Qaeda. The group is designated as a terrorist group by the United Nations Security Council, the North Atlantic Treaty Organization (NATO), the European Union, and various other countries. Under bin Laden, Al-Qaeda was responsible for the September 11 attacks in the United States and many other mass-casualty attacks worldwide.
The hijackers in the September 11 attacks were 19 men affiliated with the militant Islamist group al-Qaeda. They hailed from four countries; 15 of them were citizens of Saudi Arabia, two were from the United Arab Emirates, one was from Egypt, and one from Lebanon. To carry out the attacks, the hijackers were organized into four teams, each led by a pilot-trained hijacker who would commandeer the flight with three or four "muscle hijackers" who were trained to help subdue the pilots, passengers, and crew. Each team was assigned to a different flight and given a unique target to crash their respective planes into.
Saeed Abdallah Ali Sulayman al-Ghamdi was one of four terrorist hijackers of United Airlines Flight 93 as part of the September 11 attacks.
Operation Infinite Reach was the codename for American cruise missile strikes on Al-Qaeda bases that were launched concurrently across two continents on August 20, 1998. Launched by the U.S. Navy, the strikes hit the Al-Shifa pharmaceutical factory in Khartoum, Sudan, and a camp in Khost Province, Afghanistan, in retaliation for al-Qaeda's August 7 bombings of American embassies in Kenya and Tanzania, which killed 224 people and injured over 4,000 others. Operation Infinite Reach was the first time the United States acknowledged a preemptive strike against a violent non-state actor.
Walid Muhammad Salih bin Mubarak bin Attash is a Yemeni prisoner held at the United States' Guantanamo Bay detention camp under terrorism-related charges, and is suspected of playing a key role in the early stages of the 9/11 attacks. The Office of the Director of National Intelligence has described him as a "scion of a terrorist family". American prosecutors at the Guantanamo military commissions allege that he helped in the preparation of the 1998 East Africa Embassy bombings and the USS Cole bombing and acted as a bodyguard to Osama bin Laden, gaining himself the reputation of an "errand boy". He is formally charged with selecting and helping to train several of the hijackers of the September 11 attacks.
The Bin Laden family, also spelled Bin Ladin, is a wealthy family intimately connected with the innermost circles of the Saudi royal family. It is the namesake and controlling shareholder of Saudi Binladin Group, a multinational construction firm. Following the September 11 attacks, the family became the subject of media attention and scrutiny through the activities of Osama bin Laden, the former head of al-Qaeda.
The 20th hijacker is a possible additional terrorist in the September 11 attacks of 2001 who, for unknown reasons, was unable to participate. The 20th hijacker, though not present during the actual attacks, is said to have been deeply involved in the preparations. There were many variations of the 9/11 plot, with the number of terrorists fluctuating with available resources and changing circumstances. In the end, there were 19 hijackers: three of the planes were taken over by five members each and the fourth was hijacked by four people. The latter plane, United Airlines Flight 93, crashed into a field near Shanksville, Pennsylvania, due to the resistance from passengers before it could reach its target in Washington, D.C.
On September 11, 2001, 19 al-Qaeda terrorists took control of four commercial aircraft and used them as suicide weapons in a series of four coordinated acts of terrorism to strike the World Trade Center in New York City, The Pentagon in Arlington County, Virginia, and an additional target in Washington, D.C. Two aircraft hit the World Trade Center while the third hit the Pentagon. A fourth plane did not arrive at its target, but crashed into a field in Pennsylvania after a passenger revolt. The intended target is believed to have been the United States Capitol. As a result, 2,977 victims were killed, making it the deadliest foreign attack on U.S. soil, exceeding Japan's surprise attack on Pearl Harbor in Honolulu, Hawaii, on December 7, 1941, which killed 2,335 members of the United States Armed Forces and 68 civilians. The effort was carefully planned by al-Qaeda, which sent 19 terrorists to take over Boeing 757 and Boeing 767 aircraft, operated by American Airlines and United Airlines.
The September 11 attacks, commonly known as 9/11, were four coordinated suicide terrorist attacks carried out by al-Qaeda against the United States on Tuesday, September 11, 2001. That morning, 19 terrorists hijacked four commercial airliners scheduled to travel from the New England and Mid-Atlantic regions of the East Coast to California. The hijackers crashed the first two planes into the Twin Towers of the World Trade Center in New York City, two of the five tallest buildings in the world at the time, and aimed the next two flights toward targets in or near Washington, D.C. in a less coordinated attack on the nation's capital. The third team succeeded in crashing into the Pentagon, the headquarters of the U.S. Department of Defense in Arlington County, Virginia, while the fourth plane crashed in rural Pennsylvania following a passenger revolt. The attacks killed nearly 3,000 people and instigated the multi-decade global war on terror.
The following is a list of attacks which have been carried out by Al-Qaeda.
The Bin Laden Issue Station, also known as Alec Station, was a standalone unit of the Central Intelligence Agency in operation from 1996 to 2005 dedicated to tracking Osama bin Laden and his associates, both before and after the 9/11 attacks. It was headed initially by CIA analyst Michael Scheuer and later by Richard Blee and others.
Hamza bin Osama bin Mohammed bin Awad bin Laden, better known as Hamza bin Laden, was a Saudi Arabian-born member of Al-Qaeda. He was a son of Al-Qaeda leader Osama bin Laden, and, following his father's death in 2011 and the attacks on the World Trade Center in New York City, he was described as an emerging leader of the Al-Qaeda organization.
Osama bin Laden, a militant Islamist and reported founder of al-Qaeda, in conjunction with several other Islamic militant leaders, issued two fatawa – in 1996 and then again in 1998—that military personnel from the United States and allied countries until they withdraw support for Israel and withdraw military forces from Islamic countries. He was indicted in United States federal court for his alleged involvement in the 1998 U.S. embassy bombings in Dar es Salaam, Tanzania and Nairobi, Kenya, and was on the U.S. Federal Bureau of Investigation's Ten Most Wanted Fugitives list until his death.
At around 9:30 pm on September 11, 2001, George Tenet, director of the Central Intelligence Agency (CIA) told President George W. Bush and U.S. senior officials that the CIA's Counterterrorism Center had determined that Osama bin Laden and al-Qaeda were responsible for the September 11 attacks. Two weeks after the terrorist attacks on September 11, 2001, the Federal Bureau of Investigation connected the hijackers to al-Qaeda, a militant Salafist Islamist multi-national organization. In a number of video, audio, interview and printed statements, senior members of al-Qaeda have also asserted responsibility for organizing the September 11 attacks.
Mohammed Atef was the military chief of al-Qaeda, and was considered one of Osama bin Laden's two deputies, the other being Ayman Al Zawahiri, although Atef's role in the organization was not well known by intelligence agencies for years. He was killed in a US airstrike in November 2001.
Since the September 11 attacks in the United States in 2001, allegations of Saudi Arabian government involvement in the attacks have been made, with the Kingdom of Saudi Arabia regularly denying such claims.
The following is an outline of the series of events that led up the War in Afghanistan (2001–2021).
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| Victims |
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| Hijacked airliners | |
| Crash sites | |
| Aftermath | |
| Response | |
| Perpetrators | |
| Inquiries | |
| Cultural effects | |
| Miscellaneous |
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