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".
Robert Baer
Baer wrote about the events of the September 11, 2001 terrorist attacks in "The Guardian" "[D]id bin Laden act alone, through his own al-Qaida network, in launching the attacks? About that I'm far more certain and emphatic: no." He later stated, "For the record, I don't believe that the World Trade Center was brought down by our own explosives, or that a rocket, rather than an airliner, hit the Pentagon. I spent a career in the CIA trying to orchestrate plots, wasn't all that good at it, and certainly couldn't carry off 9/11. Nor could the real pros I had the pleasure to work with."