Louisiana State Police say the explosion at Camp Minden happened in one of many bunkers where 7,800 tons of explosive M-6 propellant is stored.
Trooper Matt Harris says the hazardous materials unit is surveying the area by air to see the extent of damage.
Harris says once the area is deemed safe, investigators will start looking for a cause of Thursday morning's explosion. He says no one was injured in the blast.
Explosive Services International is in the process of destroying propellant that was left behind when Explo Systems Inc. went bankrupt in 2013.
Webster Parish official Jenny Reynolds says she was standing on her front porch drinking coffee when she saw a flash and then heard an explosion coming from the direction of Camp Minden.
