Shanksville, Penn., crash site 9/11

On September 12, 2001, investigators combed the crater left by the crash of United Airlines flight 93 near Shanksville, Pennsylvania. Smoke rose behind the officials as they examined the site. Flight 93 was one of four planes hijacked during a deadly and destructive series of attacks. The operation focused on analyzing the wreckage and the impact zone to gather evidence regarding the events surrounding the hijacking and subsequent crash in the Pennsylvania field.