SHANKSVILLE, Pa., Sept. 10 (UPI) -- In commemoration of the Sept. 11, 2001, attacks, investigators who processed the Pennsylvania crash site of United Flight 93 came together to recall their work.
Among their discoveries at the grisly crash site: A metal shank one of the hijackers used to take control of the airplane, a passport that identified one of the hijackers and the black box recording devices that spelled out in crucial and heartbreaking detail passengers' actions to bring down the plane after it became clear the hijackers were on a suicide mission.