Evidence contradicting some conspiracy theorists' claim of a missile hitting the Pentagon have been described by researchers within the 9/11 Truth Movement, such as Jim Hoffman, in his essay "The Pentagon Attack: What the Physical Evidence Shows", and by others broadly refuting the role of other conspiracies in the attacks. The evidence refuting missile claims includes airplane debris including Flight 77's black boxes, the nose cone, landing gear, an airplane tire, and an intact cockpit seat were observed at the crash site. The remains of passengers from Flight 77 were indeed found at the Pentagon crash site and their identities confirmed by DNA analysis. Many eyewitnesses saw the plane strike the Pentagon. Further, Flight 77 passengers made phone calls reporting that their airplane had been hijacked. For example, passenger Renee May called her mother to tell her that the plane had been hijacked and that the passengers had been herded to the back of the plane. Another passenger named Barbara Olson called her husband (U.S. Solicitor General Theodore Olson) and said that the flight had been hijacked, and that the hijackers had knives and box cutters. Some conspiracy theories say the phone calls the passengers made were fabricated by voice morphing, the passengers' bodies disposed of, and a missile fired at the Pentagon.