Delta Air Lines said Friday night that it has extended restrictions and stopped accepting all products at Detroit Metropolitan Airport bound for Montreal and Toronto due to limited access to roads and bridges in the cities resulting from trucker protests against the Canadian government’s pandemic mandates.

The embargo is in effect until Saturday, Delta Cargo (NYSE: DAL) said in a notice to customers.

Some roads are closed in downtown Toronto as officials prepare for weekend protests, according to Canadian media. A protest is scheduled for Saturday in Montreal in solidarity with the convoy to Ottawa where truckers and others used their vehicles to block access to the Ambassador Bridge, the largest commercial crossing in North America.

Ontario officials have declared an emergency and warned of jail time and other consequences for truckers who continue to illegally block international trade. The blockade has drastically reduced milk flows between auto factories and suppliers in the United States and Canada, forcing automakers to suspend or reduce production. Other industries have also been affected, with trucking companies forced to make hour-long detours to other land ports.