Crews are investigating an explosion Wednesday morning at Northrop Grumman's rocket test facility in Promontory, a remote location in Box Elder County.

This photo provided by the Box Elder County Sheriff's Office shows the wreckage from an explosion at Northrop Grumman's remote rocket testing site on Wednesday, April 16, 2025, in Promontory ...

PROMONTORY, Box Elder County — No solid rocket motors were lost or damaged in an explosion Wednesday in remote Promontory, a company spokesperson for Northrop Grumman told KSL.com Friday.

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 ...

PROMONTORY, Utah (AP) — An explosion at Northrop Grumman’s remote rocket testing site in northern Utah destroyed a building Wednesday. Officers found no injuries or fatalities in their initial ...