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These are all of the cruise lines suspending their operations

In this image from video, provided by the California National Guard, a helicopter carrying airmen with the 129th Rescue Wing flies over the Grand Princess cruise ship off the coast of California Thursday, March 5, 2020. Scrambling to keep the coronavirus at bay, officials ordered a cruise ship with 3,500 people aboard to stay back from the California coast Thursday until passengers and crew can be tested, after a traveler from its previous voyage died of the disease and at least two others became infected. Airmen lowered test kits onto the 951-foot (290-meter) Grand Princess by rope as the vessel lay at anchor off Northern California, and authorities said the results would be available on Friday. Princess Cruise Lines said fewer than 100 people aboard had been identified for testing. (California National Guard via AP)
In this image from video, provided by the California National Guard, a helicopter carrying airmen with the 129th Rescue Wing flies over the Grand Princess cruise ship off the coast of California Thursday, March 5, 2020. Scrambling to keep the coronavirus at bay, officials ordered a cruise ship with 3,500 people aboard to stay back from the California coast Thursday until passengers and crew can be tested, after a traveler from its previous voyage died of the disease and at least two others became infected. Airmen lowered test kits onto the 951-foot (290-meter) Grand Princess by rope as the vessel lay at anchor off Northern California, and authorities said the results would be available on Friday. Princess Cruise Lines said fewer than 100 people aboard had been identified for testing. (California National Guard via AP)

Carnival, Royal Caribbean, Norwegian and MSC cruise lines are suspending outbound cruises for 30 days, according to a tweet from President Trump on Friday.

Royal Caribbean and Norwegian both have posted notices of the suspension online.

Princess Cruises on Thursday announced a 60-day suspension in global operations from March 12 to May 10.

The measure comes in the wake of the government cruise warning and the infection and quarantine of passengers from two Princess ships.

Viking is also temporarily suspending operations of river and ocean cruises from March 12 to April 30.

Virgin Voyages has postponed the maiden voyage of its first cruise ship, Scarlet Lady, until August.

Before the more drastic measures, cruise lines had recently instituted flexible rebooking policies.

Carnival Cruise Line recently sent letters to guests booked through May 31 offering options to reschedule and onboard credits for those who proceed with their plans. Other cruise lines have extended similar offers.

Many cruises to and from mainland China and other Asian destinations were canceled or modified earlier in the outbreak.