Anderson fire investigators are trying to determine what caused a travel trailer to explode Monday night. It took firefighters only ten minutes to knock down the flames after the trailer blew up at about 6:35PM on Anna Road off of Spring Gulch Road off of Highway 273. Investigators are trying to determine if it was a honey oil lab that caused the explosion and whether anyone was home at the time of the fire. The trailer was completely destroyed. There was no damage to any adjacent homes.