Windsor firefighters were called to a fire on the roof of an industrial building. Crews responded to the upgraded structure fire in the 2700 block of St. Etienne Boulevard at 8:30 a.m. on Monday. It was reported that there was smoke in an industrial building. Water was applied to the roof top unit that had light smoke coming from it. Officials say the fire is out and there was no extension into the building. Ventilation of some very light smoke remaining inside took place afterwards. Firefighters were being released from the address around 9 a.m.