It's unclear when incident occurred, and no background on what caused the explosion has been provided. The sheriff's office says the oil pad where the incident occurred was not operational.

Radford, Va. (AP) — Officials say no one was injured in an explosion early Friday at a U.S. Army ammunition plant in southwestern Virginia. A statement from the Radford Army Ammunition Plant ...

Radford, Va. (AP) — No one was injured in an explosion early Friday at a U.S. Army ammunition plant in southwestern Virginia, authorities said. The explosion happened at about 12:30 a.m. in the ...