Ford is recalling approximately 2 million F-150 pickup trucks in North America over concerns that seat belt pretensioners could ignite fires.

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The company said there have been 17 reports of smoke or fire in the U.S. and six in Canada, though it is not aware of any accidents or injuries as a result of the condition. More than 1.6 million vehicles in the U.S. – including territories – and nearly 340,000 in Canada and approximately 36,800 in Mexico that are related to the concern.

An investigation by Ford found that some front seat belt pretensioners, devices that tighten the belt in the event of a crash, can generate excessive sparks when they deploy. Much like an airbag, the pretensioners are activated by a small explosion. The automaker said the fires started in the B-pillars – the vertical roof support located between the front and rear doors.

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