Some of the world's biggest carmakers say production is being affected by protesting truckers in Canada.
The anti-vaccine protests in Ottawa and at two Canada-US border crossings have been going on for two weeks.
The rallies, known as the Freedom Convoy, have led to Ford and Toyota plant shutdowns and curtailed trade worth more than $300m (£221m) a day.
Canada's Transport Minister, Omar Alghabra, called it an illegal economic blockade against all Canadians.
Toyota, the world's biggest car manufacturer, has halted production at three factories in Ontario, saying no more vehicles will be produced there this week.
Output has also been halted at a Ford engine factory, while Stellantis, which owns Chrysler, said parts shortages had affected shifts at its Ontario plant.
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