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Arson investigators are trying to determine the cause of a fire on the West Side that damaged three buildings and injured a firefighter. San Antonio fire crews responded about 7:30 p.m. Sunday to the two-alarm fire on Zarzamora Street near West Salinas. The fire reportedly started in a tire shop, but high winds spread the flames to two other businesses nearby. A firefighter was injured when embers got into his eye. He was taken to University Hospital.