Explosion destroys Northrop Grumman building on remote 'Rocket Ranch'

A Northrop Grumman building was destroyed by an explosion at a facility in Promontory, Box Elder County, Wednesday morning.

A Northrop Grumman building was destroyed by an explosion at a facility in Promontory, Box Elder County, Wednesday morning. (Box Elder County Sheriff's Office)


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PROMONTORY, Box Elder County — An explosion rocked the Northrop Grumman rocket testing facility in remote Promontory, around 32 miles west of Brigham City.

Reports of the explosion came in around 7:38 AM, according to the Box Elder County Sheriff's Office.

Palmer said the building is a total loss and was on fire Wednesday morning, but no injuries were reported, said Box Elder County Chief Sheriff's Deputy Cade Palmer. Crews were dispatched to the location, where more information will be gathered.

The location, part of the "Rocket Ranch," has been a testing ground for solid rocket motors in recent years, according to the company. Northrop Grumman has been expanding motor production, constructing new buildings and modifying old ones to scale up by 2030, a past press release says.

Company representatives were not immediately available for comment. No information was available on what exact building was destroyed, the extent of damage to the facility, environmental considerations, and how the disaster affects ongoing operations.

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Collin Leonard is a reporter for KSL.com. He covers federal and state courts, northern Utah communities and military news. Collin is a graduate of Duke University.
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