1057AM-Conroe firefighters, Caney Creek and Cut and Shoot firefighters were initially dispatched to a industrial plant explosion on Butler Road just off Loop 336. They went on scene with heavy fire and immediately called for a second alarm which was to include a foam truck and HazMat truck. With chemicals inside the fire burned itself down to where firefighters could approach it and knock down the remaining flames. At this point smoke is blowing into a heavy wooded area so no evacuations have been called for. Expect heavy traffic on the East Loop between FM 3083 and SH 1o5 for the next few hours.