World Trade Center site
On the morning of September 11, 2001, Islamic terrorists affiliated with Al-Qaeda hijacked American Airlines Flight 11 and United Airlines Flight 175, both which were en route to Los Angeles, and intentionally crashed them into the two main towers of the World Trade Center. The towers collapsed within two hours of the collisions. 2,606 people, including 2,192 civilians, 71 law enforcement officers, and 343 firefighters, who were in the towers and in the surrounding area died in the attacks, as well as 147 civilians and the 10 hijackers aboard the two airliners. After the collapse of the World Trade Center, hospital workers and law enforcement officers began referring to the World Trade Center site as "Ground Zero".
Ramzi Yousef
The World Trade Center bombing was a terrorist attack that occurred on 26 February 1993, when a car bomb was detonated below Tower One of the World Trade Center in New York City, New York. The 1,500 lb (680 kg) urea nitrate-hydrogen gas enhanced device was intended to knock the North Tower (Tower 1) into the South Tower (Tower 2), to bring both towers down and kill thousands of people. It failed to do so, but killed six civilians and injured 1,042, including 919 civilians (including an EMS worker), 88 firefighters, and 35 police officers.