SANTA PAULA, Calif. (AP) — Authorities say at least one person was killed when a helicopter crashed in Southern California.

Federal Aviation Administration spokesman Ian Gregor says the helicopter went down in a dry riverbed in Ventura County three miles west of the Santa Paula Airport at about 10:30 a.m. Friday.

County fire spokesman Bill Nash says the helicopter apparently clipped and downed power lines before crashing, and a small fire broke out.

Nash says one person was found dead.

It wasn't immediately clear how many people were on the helicopter or who owns it.

The FAA and the National Transportation Safety Board will investigate the crash.