SUMMERTOWN, TN – A possible structure fire call turned out to be a backfiring pickup truck. Members of the Summertown Fire Department were called to Dollar General on Highway 20 just before 8 am Saturday. A 911 caller indicated that they had heard a loud explosion and then saw smoke in the area which was initially believed to be coming from the retail store. Rescuers were promptly sent to the scene however it was quickly determined that a truck had backfired near the property and produced a large amount of smoke.