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Investigators are trying to determine the cause of a two-alarm fire that destroyed a vacant warehouse on Thursday night. More than three-dozen San Antonio Fire Department units responded around 9 p.m. to the blaze on Rittiman Road near East Loop 410. No one was inside the abandoned building, and there were no injuries reported. By 10:30 p.m., fire crews said they would be on the scene for some time putting out hotspots.