Los Angeles County Fire dispatcher Robert Diaz says the crash occurred about 3:40 a.m. Sunday at the Polsa Rosa Ranch in Acton. Diaz says everyone on board died.
The three people have not been identified.
Philip Sokoloski, a spokesman for FilmL.A., which processes filming permits for location shootings in the Los Angeles region, said a production company had been approved to use a helicopter for a reality TV show. The shoot was scheduled to go from Saturday afternoon into Saturday night.
Permit paperwork shows Bongo, Inc. was working on an untitled military-theme program. Records also show Crossbow Helicopters received approval to participate in filming from the Federal Aviation Administration.
"We wouldn't have referenced helicopter activity if we didn't already have pre-approval from the FAA," Sokoloski said.
Television footage showed mangled wreckage in a rugged canyon area near Soledad Canyon Road.
According to its website, Polsa Rosa is a "movie ranch" where film crews can utilize a variety of terrains as well as two airstrips. The ranch, according to the Internet Movie Database, was used in "Windtalkers" and last year's remake of "Red Dawn."
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