LOS ANGELES (CBS) — General Motors wants the owners of 8,000 Chevrolet Volts to bring their cars in to dealers to address possible battery fire issues.

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GM is asking owners to take their electric and gas cars to dealers to have the structure around the cars’ batteries strengthened.

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After a fire three weeks after a side-impact crash test conducted by the National Highway Traffic Safety Administration prompted more tests of the ground-breaking sedan. In three more side-impact crash tests on separate Volts, two sparked or caught fire.

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The fires have been blamed on a coolant leak that caused an electrical short.