One person has died and four were injured Tuesday after an explosion at an Army ammunition plant in Missouri, officials said.

The explosion took place in a mixing building at Lake City Army Ammunition Plant in Independence, Missouri at approximately 1 a.m.

One worker was killed and four were treated at the scene but refused further medical treatment, according to a spokesperson.

Scott Allen with the U.S. Department of Labor's Occupational Safety and Health Administration said federal workplace safety officials are headed to Independence to investigate the cause of the deadly explosion.

The plant manufactures small-caliber ammunition and operates the North Atlantic Treaty Organization test center. It sits on 3,935 acres in Independence, just east of Kansas City.

Fortunately it's limited damage so production won't be held up long.

I hear about ammo plants and trucks transporting primers blowing up, not a job I would be comfortable in.