Al-Qaeda
The origins of al-Qaeda can be traced to 1979 when the Soviet Union invaded Afghanistan. Osama bin Laden traveled to the central Asian country to volunteer, viewing the war as a See more

The 9/11 attacks resulted in immediate responses to the event, including domestic reactions; closings and cancellations; hate crimes See more

FBI
Immediately after the attacks, the Federal Bureau of Investigation started PENTTBOM, the largest criminal inquiry in United States history. At its … See more

In the days immediately following the attacks, many memorials and vigils were held around the world, and photographs of the dead and missing were posted around Ground Zero. A witness described being unable to "get away from faces of innocent victims who were … See more

Early on the morning of September 11, 2001, 19 hijackers took control of four commercial airliners (two Boeing 757s and two Boeing 767s) en route to California (three of them … See more

Health issues
Hundreds of thousands of tons of toxic debris containing more than 2,500 contaminants, … See more

On the day of the attacks, New York City mayor Rudy Giuliani stated: "We will rebuild. We're going to come out of this stronger than before, politically stronger, economically stronger. The skyline will be made whole again."
The damaged … See more