Canada will limit international travel to just four airports due to the coronavirus outbreak.

According to CTV News, Prime Minister Justin Trudeau will announce that some international flights will be rerouted to Montreal, Toronto, Calgary or Vancouver.

CTV News has learned the Prime Minister will announce some international flights will be rerouted to Montreal, Toronto, Calgary or Vancouver. Details to be announced by the PM today at 1 p.m.

— Michel Boyer (@BoyerMichel) March 16, 2020

The new policy will ensure that airports accepting international flights have the capacity to properly screen for COVID-19.

Canada has already placed some restrictions on international travel; on Friday, Transport Minister Marc Garneau announced a ban on cruise ships with more than 500 passengers.

Large ships will be prevented from docking in Canada between April 2 to July 1.

To protect Canadians, I announced today measures to prevent the spread of COVID-19. This season, cruise ships will not be permitted to dock at Canadian ports from April 2 to July 1. In Northern and Arctic ports, the cruise ship season will be deferred for the entire season.

— Marc Garneau (@MarcGarneau) March 13, 2020

Canada is also urging all Canadians abroad to return to the country while they still can.

There are currently 345 cases of coronavirus in Canada. Trudeau will update the nation on COVID-19 measures during his press conference on Monday at 1 p.m. ET.