The U.S. National Highway Traffic Safety Administration said on Thursday it is upgrading a probe of more than 8 million air bag inflators made by ARC Automotive Inc after a driver was killed in Canada when an inflator ruptured in a Hyundai vehicle last month.The investigation covers inflators used by General Motors Co, Fiat Chrysler Automobiles NV, Hyundai Motor Co and Kia Motors and covers at least 8 million inflators used by the automakers through 2004, but could include newer vehicles, the agency said. Canadian regulators are also investigating.
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