MOORPARK, Calif. — Authorities have identified the father and son killed in the crash of small plane in Southern California during the weekend.

The Ventura County Sheriff’s Department says 57-year-old James Harlan of Calabasas and his 15-year-old son, Dylan, died Sunday when their single-engine airplane crashed near a ranch in Santa Rosa Valley northwest of Los Angeles.

Witnesses say the plane was flying just above treetops before it went down in a horse arena, which was empty at the time.

The Sheriff’s Department says Southern California Edison crews found evidence that the plane hit one of several high-voltage power lines near the crash site.

The aircraft departed nearby Camarillo Airport earlier in the day.