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Three members of a reality TV crew were killed when their helicopter crashed in the middle of the night in northern Los Angeles.

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The names of the victims weren't released; however, they were filming a military-themed show for the Discovery Channel when the crash happened around 3:40 a.m. Sunday, the Huffington Post reports. The show was in development and had not been announced by Discovery, according to the report. 

A Discovery Channel spokesperson tells "A production company was shooting  a show for Discovery Channel when this tragic accident occurred. We are all cooperating fully with authorities. Our thoughts and prayers go out to the families."

The three people who were killed were the only ones aboard the helicopter at the time of the crash.