A pilot was killed Tuesday after his small plane crashed in the U.S. state of Oklahoma, local officials said. The single-engine airplane crashed near the Anadarko Municipal Airport, in the Oklahoma city of Anadarko, the news website Newok. com. quoted George Brown of the Oklahoma Highway Patrol as reporting. The crash was reported at about 1 p.m. Tuesday and the pilot appeared to be the only person on board the plane, said Brown. Brown said witnesses reported the plane appeared to be on approach to the airport, but no further information was available about where the flight originated or what its destination was. The Oklahoma Highway Patrol is investigating the cause of the crash, the report said.