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The following outline is provided as an overview of and topical guide to the September 11 attacks and their consequences:
September 11 attacks – four coordinated suicide attacks upon the United States in New York City and the Washington, D.C., area on September 11, 2001. On that Tuesday morning, 19 terrorists from the Islamist militant group al-Qaeda hijacked four passenger jets. The hijackers intentionally crashed two planes, American Airlines Flight 11 and United Airlines Flight 175, into the Twin Towers of the World Trade Center in New York City; both towers collapsed within two hours. Hijackers crashed American Airlines Flight 77 into the Pentagon in Arlington, Virginia. The fourth jet, United Airlines Flight 93, crashed into a field near Shanksville, Pennsylvania, after passengers attempted to take control before it could reach the hijacker's intended target in Washington, D.C. Nearly 3,000 died in the attacks, and the September 11 attacks have had broad and lasting consequences to military policy, politics, and foreign relations. Effects have also been seen in literature, film, and popular culture.
On the morning of September 11, 2001, 19 al-Qaeda terrorists hijacked four commercial passenger jet airliners, intentionally crashing two into the World Trade Center in New York City. The hijackers crashed a third airliner into the Pentagon. The fourth plane crashed in a field near Shanksville, Pennsylvania. Nearly 3,000 victims and the 19 hijackers died in the attacks.
The leader of Al-Qaeda, Osama bin Laden, eventually claimed responsibility for the attacks.
The United States launched the War on Terror, invading Afghanistan.
The US enacted the USA PATRIOT Act. Many other countries also strengthened their anti-terrorism legislation and expanded law enforcement powers.
Some American stock exchanges stayed closed for the rest of the week following the attack and posted enormous losses on reopening, especially in the airline and insurance industries. The destruction of billions of dollars' worth of office space caused serious damage to the economy of Lower Manhattan.
The Pentagon Memorial was built adjacent to the building. The rebuilding process has started on the World Trade Center site. In 2006, a new office tower was completed on the site of 7 World Trade Center. The new One World Trade Center was later built and was completed in 2014. Three more towers were originally expected to be built between 2007 and 2012 on the site, but are now delayed to 2018. Ground was broken for the Flight 93 National Memorial on November 8, 2009, and the first phase of construction is expected to be ready for the 10th anniversary of the attacks on September 11, 2011.
The original World Trade Center (WTC) was a complex of seven buildings in Lower Manhattan in New York City that was destroyed September 11, 2001. The site is being rebuilt with six new skyscrapers and a memorial to the casualties of the attacks.
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American Airlines Flight 77 was a scheduled domestic transcontinental passenger flight from Dulles International Airport in Northern Virginia to Los Angeles International Airport in Los Angeles. The Boeing 757-200 aircraft serving the flight was hijacked by five al-Qaeda terrorists on the morning of September 11, 2001, as part of the September 11 attacks. The hijacked airliner was deliberately crashed into the Pentagon in Arlington County, Virginia, killing all 64 aboard and another 125 in the building.
The aircraft hijackers in the September 11 attacks were 19 men affiliated with jihadist organization 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. Mohamed Atta was the assigned ringleader over all 4 groups.
United Airlines Flight 175 was a domestic passenger flight from Logan International Airport in Boston to Los Angeles International Airport in California that was hijacked by five al-Qaeda terrorists on the morning of September 11, 2001, as part of the September 11 attacks. The aircraft involved, a Boeing 767-200 carrying 51 passengers and 9 crew members, was deliberately crashed into the South Tower of the World Trade Center in New York City, killing everyone aboard and causing the deaths of more than 600 people in the South Tower's upper levels in addition to an unknown number of civilians and emergency personnel on floors beneath the impact zone. Flight 175 is the second-deadliest plane crash in aviation history, surpassed only by American Airlines Flight 11.
United Airlines Flight 93 was a domestic scheduled passenger flight that was hijacked by four al-Qaeda terrorists on the morning of September 11, 2001, as part of the September 11 attacks. The hijackers planned to crash the plane into a federal government building in the national capital of Washington, D.C. The mission became a partial failure when the passengers fought back, forcing the terrorists to crash the plane in Somerset County, Pennsylvania, preventing them from reaching al-Qaeda's intended target, but killing everyone aboard the flight. The airliner involved, a Boeing 757-200 with 44 passengers and crew, was flying United Airlines' daily scheduled morning flight from Newark International Airport in New Jersey to San Francisco International Airport in California, making it the only plane hijacked that day not to be a Los Angeles–bound flight.
Shanksville is a borough in Somerset County, Pennsylvania, United States. It has a population of 197 as of the 2020 U.S. census. It is part of the Somerset, Pennsylvania Micropolitan Statistical Area and is located 78 miles (126 km) southeast of Pittsburgh and 226 miles (364 km) west of Philadelphia.
The September 11 attacks of 2001, in addition to being a unique act of terrorism, constituted a media event on a scale not seen since the advent of civilian global satellite links. Instant worldwide reaction and debate were made possible by round-the-clock television news organizations and by the internet. As a result, most of the events listed below were known by a large portion of the world's population as they occurred.
There are various conspiracy theories that attribute the preparation and execution of the September 11 attacks against the United States to parties other than, or in addition to, al-Qaeda. These include the theory that high-level government officials had advance knowledge of the attacks. Government investigations and independent reviews have rejected these theories. Proponents of these theories assert that there are inconsistencies in the commonly accepted version, or that there exists evidence that was ignored, concealed, or overlooked.
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.
PENTTBOM is the codename for the Federal Bureau of Investigation's probe into the September 11 attacks of 2001, the largest criminal inquiry in the FBI's history. Its name stands for "Pentagon/Twin Towers Bombing Investigation". The investigation was launched on September 11, 2001, and involved 4,000 special agents and 3,000 professional employees.
Inside 9/11 is a three-part television documentary film produced by Towers Productions that premiered on August 21 and August 22, 2005, on the National Geographic Channel. The program covers the September 11 attacks in 2001, the events that led to it, and its aftermath. The first part consisted of examining, event by event, the build-up towards September 11. The second part consisted of the events of 9/11 itself and the aftermath. Experts and eyewitnesses provide their accounts of the attacks, and the events are covered in chronological order.
The Flight 93 National Memorial is a memorial built to commemorate the crash of United Airlines Flight 93, which was one of four aircraft hijacked during the September 11 attacks in 2001. The memorial is located in Somerset County, Pennsylvania, with the vast majority in Stonycreek Township, and with a small portion in Shade Township. It is 78 miles (126 km) southeast of Pittsburgh, 122 miles (196 km) west of Harrisburg, and 226 miles (364 km) west of Philadelphia.
The September 11 attacks, commonly known as 9/11, were four coordinated Islamist terrorist suicide attacks carried out by al-Qaeda against the United States in 2001. On that Tuesday morning, 19 terrorists hijacked four commercial airliners scheduled to travel from the East Coast to California. The first two teams of hijackers crashed the first two planes into the Twin Towers of the World Trade Center in New York City, while the remaining hijackers aimed the next two flights toward targets in or near Washington, D.C., in an attack on the nation's capital. The third team succeeded in striking the Pentagon, the headquarters of the U.S. Department of Defense in Arlington County, Virginia, while the fourth plane hijacked by the fourth team crashed in rural Pennsylvania during a passenger revolt. The September 11 attacks killed 2,977 people, making it the deadliest terrorist attack in history. In response to the attacks, the United States waged the multi-decade global war on terror to eliminate hostile groups deemed terrorist organizations, as well as the foreign governments purported to support them, in Afghanistan, Iraq, Syria, and several other countries.
The following list contains dates beyond October 2001 involving the September 11 attacks.
Various conspiracy theories allege that certain institutions or individuals had foreknowledge of the September 11 attacks in the United States in 2001. Some of the primary debates include whether the Bush administration or the United States Armed Forces had awareness of the planned attack methods, the precise volume of intelligence that American agencies had regarding al-Qaeda activities inside the United States, whether the put options placed on United Airlines and American Airlines and other trades indicated foreknowledge, and why the identities of the traders have never been made public.
The Shanksville Volunteer Fire Department is a volunteer fire department in Shanksville, Pennsylvania. The department provides fire protection and emergency medical services to the boroughs of Shanksville and Indian Lake as well as to Stonycreek Township. The response area is approximately 62 square miles (160 km2) with an estimated 2,500 residents. Additionally the department is responsible for a 15-mile (24 km) stretch of the Pennsylvania Turnpike.
Urban terrorism is the targeted use of terrorism in urban populations in order to cause the most harm, injury, death, or property damage. Since urban areas have significantly higher population densities than rural areas, targeting those areas can maximize the effect of the terrorist attack.
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.
The King of Prussia Volunteer Fire Company 9/11 Memorial is a memorial in King of Prussia CDP, Pennsylvania, that honors the lives lost in the September 11 attacks in 2001. The memorial is located adjacent to the King of Prussia Volunteer Fire Company station on Allendale Road across from the King of Prussia mall. The 9/11 Memorial consists of a monument, a gazebo, a patio, and an entrance path and stairs that commemorates the attacks on the World Trade Center and The Pentagon along with the crash of United Airlines Flight 93. Among the features of the memorial are two steel beams that came from the actual World Trade Center. The memorial was dedicated on the tenth anniversary of the attacks on September 11, 2011.
This is an index of articles related to the September 11 attacks, which occurred on September 11, 2001.