It happened at the valentec plant in Webster Parish at about 5:30 Monday afternoon. Firefighters, deputies and military personnel say they dealt with the fire from that explosion at the valentec plant, into Tuesday morning. Four miles away was the closest news crews could get to the blast on Monday.The blast happened while the company was making military flares. No one was injured during the explosion. The company evacuated many of it's workers. Smoke from the explosion could be seen as far away as Shreveport. Witnesses say at first, the explosion looked like a dark yellow cloud.