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Investigators are trying to figure out what started a large grass fire in south Bexar County on Tuesday afternoon. About 30 San Antonio Fire department units responded to the blaze along Highway 281 South near Mission Grande and Del Lago Parkway. The management of the Villa Espada Apartments asked all residents to vacate, but many of them grabbed hoses and extinguishers to keep the fire away. Police and deputies temporarily closed 281 around 6 p.m. because of poor visibility due to the smoke.