Potentially defective airbags could explode with too much force.

The National Highway Traffic Safety Administration (NHTSA) has opened an investigation into airbags made by ARC Automotive Inc. that could deploy with too much force. The investigation covers about 8 million U.S. vehicles, and was prompted when a driver was killed by an ARC airbag in Canada.

According to NHTSA and Automotive News, a Canadian driver was killed in July by an airbag in a 2009 Hyundai Elantra. That ARC airbag was made in China, but NHTSA says the U.S.-market 2009 Elantra did not use the same airbag.

NHTSA had already been looking into the safety of ARC airbags since July 2015. The agency had received reports of injuries due to “driver airbag inflator rupture” problems in a 2002 Chrysler Town & Country and a 2004 Kia Optima. The ARC airbag inflators use a “hybrid” design that uses an inert gas to inflate the airbag, and an ammonium nitrate propellant to deploy it.

NHTSA says that ARC reported that as many as 8 million cars with the affected ARC airbags were sold or leased in the U.S., in cars from Chrysler, General Motors, Hyundai, and Kia.

Airbags are increasingly under scrutiny after Takata was forced to recall millions of airbags that sometimes inflated with too much power, killing 10 people in the U.S.

Sources: NHTSA, Automotive News

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