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San Antonio fire investigators say the cause of a fire at a South Side motel may remain undetermined. Fire crews responded about 6:30 a.m. Monday to the fire on South Presa near East Southcross. Investigators say the fire at the Rainbow Motel started outside on the back of one of the buildings. Because of the extensive damage, they couldn't pinpoint the cause. There were no injuries, and no evacuation was necessary because the handful of people staying at the motel were already in the parking lot.