(Fotolia)

LOS ANGELES - Three men working on a reality TV show were killed in a helicopter crash early on Sunday in Acton, California, according to county firefighters.

They told City News Service that all three occupants of the helicopter were pronounced dead at the scene. The crash happened at around 3:40 a.m. on a ranch with two airstrips that is often used as a location for movies, TV shows and commercials.

The Los Angeles Film Commission told local media outlets that a company called Bongo Productions had a permit to shoot in the area, and a reality show was being filmed.

Officials from the National Transportation Safety Board and the Federal Aviation Administration are investigating the crash.