One person was killed Wednesday night when a plane crashed into a California Highway Patrol truck scale building near Gilroy.

The San Francisco Chronicle reported that the plane went down at about 6 p.m. Wednesday, Aug. 20. The pilot – the only person aboard –was killed.

Officials with the CHP said that no one was in the weigh station at the time of the crash because its officers were all out on a training exercise.

The Federal Aviation Administration and the National Transportation Safety Board are investigating the crash. It is not yet known where the plane was headed or where it had come from.

Witnesses told the FAA that the plane was apparently trying to avoid an overpass when it crashed.