An explosives recovering and recycling business at the Camp Minden industrial site has not released details about what caused a Monday night magazine explosion that rocked northwest Louisiana. Jimmie Oxley, co-director of the Department of Homeland Security Center of Excellence in Explosives at University of Rhode Island, says TNT is no longer manufactured in the United States. Oxley says few companies specialize in extracting it from weapons, and government inspections are rigorous at such plants.