An unidentified Swiss national landed his helicopter Saturday at Andrews Air Force Base outside Washington after becoming lost, the Air Force said.
The pilot, who had a Swiss passport and identification, apparently became lost while trying to land at Maryland Airport at Indian Head, which is several miles from Andrews, according to the 89th Airlift Wing of the Air Force.
It said the FBI and Air Force Office of Special Investigations were called in to assist with an investigation of the incident, which occurred about 5 p.m. EST under clear skies.
The pilot and his aircraft remained at Andrews, pending the investigation, the Air Force said.
President Bush was spending the weekend at the Camp David presidential retreat in Maryland, a destination he typically reaches from the White House by helicopter. Air Force One, which carries the president, is based at Andrews.
An Andrews spokesman could not say if military jets were scrambled.