TRUCKEE, Calif. — Crews were in the process of rescuing the lone occupant of a small plane that went down Thursday afternoon near Truckee Tahoe Airport, according to the Nevada County Sheriff's Office.

At about 3 p.m., NCSO received a report that a single-engine aircraft crashed 7 miles east of the airport, near the California/Nevada border, said Undersheriff Joseph Salivar. The report came from the plane's occupant, using a cellphone. His injuries were unknown.

Helicopter rescue crews from Calfire and the California Highway Patrol assisted in airlifting the victim from the crash site.

The cause of the crash is unknown. It was unclear as of late Thursday if the plane was flying to or from the Truckee airport.

The investigation has been turned over to the Federal Aviation Administration and the National Transportation Safety Board.