A building is destroyed in an explosion at Northrop Grumman's rocket test site

Officers found no injuries or fatalities in their initial investigation of the wreckage, according to the Box Elder County Sheriff’s Office.

Emergency crews had responded to reports of a loud blast and a dark plume of smoke rising over the rangelands at 7:38 a.m.

It was not immediately clear which building was destroyed and what its purpose was. The aerospace and defense company maintains a large presence in Utah, where it manufactures and tests solid rocket motors.