West's Automotive, at 421 N. Reilly Road, was extensively damaged in an April 16 tornado.
Owner Morrison West said the burglars stole about $4,000 worth of parts, including 240 alternators, 115 carburetors and 120 starters. He said it likely took as long as four hours to pack up all the items.
"All that stuff weighs a lot, and they took it in trash cans towed out through the front door," West said. "There shouldn't be anything parked there at night, and they parked at the front door where everybody should be able to see them."
Police said they have no suspects in the break-in.
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