September 11

The September 11 attacks (often referred to as September 11th or 9/11 ) were a series of coordinated suicide attacks by al-Qaeda upon the United States on September 11, 2001. On that morning, 19 al-Qaeda members hijacked four commercial passenger jet airliners. The hijackers intentionally crashed two of the airliners into the Twin Towers of the World Trade Center in New York City, killing everyone on board and many others working in the buildings. Both buildings collapsed within two hours, destroying nearby buildings and damaging others. The hijackers crashed a third airliner into the Pentagon in Arlington, Virginia, just outside Washington, D.C. The fourth plane crashed into a field near Shanksville in rural Pennsylvania after some of its passengers and flight crew attempted to retake control of the plane, which the hijackers had redirected toward Washington, D.C. There were no survivors from any of the flights.

2,973 victims and the 19 hijackers died as a result of the attacks. The overwhelming majority of casualties were civilians, including nationals of over 90 countries. In addition, the death of at least one person from lung disease was ruled by a medical examiner to be a result of exposure to dust from the World Trade Center's collapse.

The United States responded to the attacks by launching "War on Terrorism" campaign. It invaded Afghanistan to depose the Taliban, who had harbored al-Qaeda terrorists. The United States also 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 upon 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 damage to the Pentagon was cleared and repaired within a year, and the Pentagon Memorial was built on the site. 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. 1 World Trade Center is currently under construction at the site and, at 1,776 ft (541 m) upon completion in 2013, it will become one of the tallest buildings in North America. Three more towers were originally expected to be built between 2007 and 2012 on the site. 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.

Attacks

Main article: Timeline for the day of the September 11 attacks

Early on the morning on September 11, 2001, nineteen hijackers took control of four commercial airliners en route to San Francisco and Los Angeles from Boston, Newark, and Washington, D.C. (Washington Dulles International Airport). At 8:46 a.m., American Airlines Flight 11 was crashed into the World Trade Center's North Tower, followed by United Airlines Flight 175 which hit the South Tower at 9:03 a.m.

Another group of hijackers flew American Airlines Flight 77 into the Pentagon at 9:37 a.m. A fourth flight, United Airlines Flight 93 crashed near Shanksville, Pennsylvania at 10:03 a.m, after the passengers on board engaged in a fight with the hijackers. Its ultimate target was thought to be either the Capitol, the meeting place of the United States Congress, or the White House.

In a September 2002 interview conducted by documentary-maker Yosri Fouda, an al Jazeera journalist, Khalid Sheikh Mohammed and Ramzi Binalshibh stated that the fourth hijacked plane was heading for the United States Capitol, not for the White House. They further stated that Al-Qaeda initially planned to fly hijacked jets into nuclear installations rather than the World Trade Center and the Pentagon, but it was decided not to attack nuclear power plants "for the moment" because of fears it could "get out of control".

During the hijacking of the airplanes, the hijackers used weapons to stab and/or kill aircraft pilots, flight attendants and passengers. Reports from phone callers from the planes indicated that knives were used by the hijackers to stab attendants and in at least one case, a passenger, during two of the hijackings. Some passengers were able to make phone calls using the cabin airphone service and mobile phones, and provide details, including that several hijackers were aboard each plane, that mace or other form of noxious chemical spray, such as tear gas or pepper spray was used, and that some people aboard had been stabbed.

The 9/11 Commission established that two of the hijackers had recently purchased Leatherman multi-function hand tools. A flight attendant on Flight 11, a passenger on Flight 175, and passengers on Flight 93 mentioned that the hijackers had bombs, but one of the passengers also mentioned he thought the bombs were fake. No traces of explosives were found at the crash sites, and the 9/11 Commission believed the bombs were probably fake.

On United Airlines Flight 93, black box recordings revealed that crew and passengers attempted to seize control of the plane from the hijackers after learning through phone calls that similarly hijacked planes had been crashed into buildings that morning. According to the transcript of Flight 93's recorder, one of the hijackers gave the order to roll the plane once it became evident that they would lose control of the plane to the passengers. Soon afterward, the aircraft crashed into a field near Shanksville in Stonycreek Township, Somerset County, Pennsylvania, at 10:03:11 a.m. local time (14:03:11 UTC). Khalid Sheikh Mohammed, organiser of the attacks, mentioned in a 2002 interview with Yosri Fouda that Flight 93's target was the United States Capitol, which was given the code name "the Faculty of Law".

Three buildings in the World Trade Center Complex collapsed due to structural failure on the day of the attack. The south tower (2 WTC) fell at approximately 9:59 a.m., after burning for 56 minutes in a fire caused by the impact of United Airlines Flight 175. The north tower (1 WTC) collapsed at 10:28 a.m., after burning for approximately 102 minutes. When the north tower collapsed, debris heavily damaged the nearby 7 World Trade Center (7 WTC) building. Its structural integrity was further compromised by fires, which led to the crumbling of the east penthouse at 5:20 p.m. and to the complete collapse of the building at 5:21 p.m.

The attacks created widespread confusion among news organizations and air traffic controllers across the United States. All international civilian air traffic was banned from landing on US soil for three days. Aircraft already in flight were either turned back or redirected to airports in Canada or Mexico. News sources aired unconfirmed and often contradictory reports throughout the day. One of the most prevalent of these reported that a car bomb had been detonated at the U.S. State Department's headquarters in Washington, D.C. Soon after reporting for the first time on the Pentagon crash, some news media also briefly reported that a fire had broken out on the National Mall. Another report went out on the Associated Press wire, claiming that a Delta Air Lines airliner—Flight 1989—had been hijacked. This report, too, turned out to be in error; the plane was briefly thought to represent a hijack risk, but it responded to controllers and landed safely in Cleveland, Ohio.

Casualties

Main article: Casualties of the September 11 attacks

There were a total of 2,995 deaths, including the 19 hijackers and 2,976 victims. The victims were distributed as follows: 246 on the four planes (from which there were no survivors), 2,605 in New York City in the towers and on the ground, and 125 at the Pentagon. All the deaths in the attacks were civilians except for 55 military personnel killed at the Pentagon.

More than 90 countries lost citizens in the attacks on the World Trade Center. In 2007, the New York City medical examiner's office added Felicia Dunn-Jones to the official death toll from the September 11 attacks. Dunn-Jones died five months after 9/11 from a lung condition which was linked to exposure to dust during the collapse of the World Trade Center. Leon Heyward, who died of lymphoma in 2008, was added to the official death toll in 2009.

NIST estimated that about 17,400 civilians were in the World Trade Center complex at the time of the attacks, while turnstile counts from the Port Authority suggest that 14,154 people were typically in the Twin Towers by 8:45 a.m. The vast majority of people below the impact zone safely evacuated the buildings, along with 18 people who were in the impact zone in the south tower and a number above the impact zone who evidently used the one intact stairwell in the south tower. At least 1,366 people died who were at or above the floors of impact in the North Tower and at least 618 in the South Tower, where evacuation had begun before the second impact. Thus over 90% of the workers and visitors who died in the Towers had been at or above impact.

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