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Members of al-Qaeda, an Islamic extremist group, took control of four commercial airplanes with full passengers. Two were flown into the world trade towers, and a third was flown into the pentagon. The fourth landed down somewhere in Pennsylvania. The end result was close to 3000 casualties, the "single largest loss of life resulting from an attack on American soil."

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Thousands of people search for survivors of the attack, in the rubble of the World Trade Towers. Genelle Guzman is the last person rescued, ending the survivor count at 18.

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Agencies act ensues during rescue effort, where firefighters try to put out the fires underneath the rubble of the building. Additionally, the FBI searches for black boxes and other materials prudent to their criminal investigation.

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New York City Department of Transportation as well as the New York City Department of Sanitation work to clear rubble from the streets and perimeter around the crash site of the towers.

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Arlington County firefighters fight fires in the Pentagon, and many Department of Defense employees go back to work in the unaffected areas of the building.

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President Bush visits the ground zero site of the attack on the World Trade Center, makes a speech to raise morale.

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Volunteers make St. Pauls Chapel into an aid station for workers/volunteers that are working on the World Trade Center cleanup. Meals, massages, music, relaxation, and first aid are offered to the workers at this church across the street from the wreckage.

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The cleanup of ground zero, otherwise known as the wreckage of the World Trade Towers, is "formalized" which entails the replacement of all volunteers with a professional workforce. More efficient means are started to be used to clear the wreckage.

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The EPA declares the air around the wreckage in New York safe, amid concerns over materials such as asbestos being put into the air after the attack on the World Trade Centers.

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The FBI assumes control of the Pentagon crime scene, relieving control from the Arlington Fire Dept.

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Mayor of New York Rudolph Giuliani reports that "it is unlikely that any more survivors will be recused from Ground Zero." Efforts are transformed from Rescue to Recovery, and the unofficial casualty count is 6,453.

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Memorial service is held at the Pentagon, a 20,000 large guest list includes family members of 9/11 victims as well as survivors.

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The Survivor Tree, a tree found beneath 9/11 wreckage with some leaves in-tact, is sent to the New York City Nursery. It grows from eight feet to 30 feet, and is placed in the 9/11 commemorative plaza.

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The first official memorial for victims' families at the wreckage of the World Trade Towers. Recovery work is stopped for this event.

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Fires at the 9/11 wreckage site are "declared extinguished".

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A temporarily-built public viewing area is opened at Ground Zero, so respects can be paid to the victims of 9/11.