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".
Fred Burton (security expert)
While with the DSS, Burton was appointed by Washington to assist in the investigation of the assassination of Israeli Prime Minister Yitzhak Rabin. He also investigated the killing of Rabbi Meir Kahane; the al Qaeda New York City bombing plots before the September 11 attacks; and the Libyan-backed terrorist attacks against diplomats in Sana'a and Khartoum. He was involved in the arrest of Ramzi Yousef, the mastermind of the first World Trade Center bombing in 1993.