The Montreal-Trudeau International Airport said Friday afternoon that all flights to and from the U.S. have been temporarily suspended. The notice comes as the Federal Aviation Administration in the U.S. issued a nationwide ground stop for all departing flights ”due to extraordinary circumstances and reasons for safety." The FAA said the ground stop is related to air traffic control communications issues. A notice on the Montreal airport’s website states that flights to and from the U.S. are suspended “until further notice.” “Passengers are encouraged to check their flight status directly with their airline,” the airport said, adding that flight delays and cancellations are expected. NAV Canada, which operates civil air traffic in Canada, told CTV News that it is monitoring the situation and that its systems are operating normally. It also added that it is implementing “traffic management measures” at the Montreal airport and others in order to safely manage traffic volumes. More to come.