Fire officials in Littleton are investigating the cause of a fire that impacted two businesses. Fire Chief Chad Miller told News 9 the fire started shortly before 10:30 p.m. Monday on Cottage Street. He said when crews arrived, they saw flames coming from the roof and some small explosions. There are no reports of any injuries. The fire destroyed the company SBP Builders and heavily damaged another business, New England Truck Tire, Miller said. He does not believe anyone was inside when the fire broke out.