The union representing dockworkers at the Port of Montreal announced that an unlimited strike will begin Monday. The union stated that the notice was made necessary after the maritime companies at the port this week announced changes to workplace conditions. Dock workers have already walked off the job twice for four-day periods. Since last Monday, ships destined for Montreal have been re-routed to ports in Halifax, New York and Saint John, New Brunswick. Negotiations at the port have been stalled principally over the issue of work schedules. The contract expired at the end of 2018.