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

A Building Is Destroyed in an Explosion at Northrop Grumman's Rocket Test Site PROMONTORY, Utah (AP) — An explosion at Northrop Grumman’s remote rocket testing site in northern Utah destroyed ...

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 ...

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 ...