DETROIT (AP) — U.S. safety investigators are looking into complaints of fires that may have been caused by the seat belts in Ford F-150 pickup trucks.

The investigation covers trucks from the 2015 through 2018. Ford sold about 2 million F-150s during those years.

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The National Highway Traffic Safety Administration is investigating five complaints that fires began in the trucks after seat belt pretensioners made by ZF-TRW or Takata were activated. Pretensioners prepare seat belts to gradually restrain passengers. Three fires destroyed the trucks, while two went out by themselves.

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The agency says the fires began in a support pillar that houses the belts. Investigators will figure out the exact cause and whether a recall is necessary. It was unclear if there were any injuries.

Ford says it’s cooperating with the probe.

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