An explosion at a Tennessee military munitions plant left multiple people dead and missing on Friday, authorities said, as secondary blasts forced rescuers to keep their distance from the burning site.

The blast occurred at Accurate Energetic Systems, according to the Hickman County Sheriff’s Office. The company’s website says it makes and tests explosives at an eight-building facility that sprawls across wooded hills near Bucksnort, a town about 60 miles (97 kilometers) southwest of Nashville.

“We do have several people at this time unaccounted for. We are trying to be mindful of families and that situation,” Humphreys County Sheriff Chris Davis said at a news conference. “We do have some that are deceased.”

The cause of the explosion was not immediately known. Video from the scene sho

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