The Coast Guard is directing cruise ships with passengers that may be infected with coronavirus to stay offshore “indefinitely” and prepare to treat passengers aboard their ships, according to a safety bulletin issued Sunday.

The Coast Guard’s new regulations mandate all ships in U.S. waters with more than 50 people give daily updates on their medical caseloads or face civil or criminal punishment. Coast Guard Rear Adm. E.C. Jones, whose district covers Florida, Georgia, South Carolina and Puerto Rico, signed the bulletin preventing ship evacuations.

“This is necessary as shore-side medical facilities may reach full capacity and lose the ability to accept and effectively treat additional critically-ill patients,” the memo said. “A potential evacuee has better access to comfortable surroundings and the medical staff on board the foreign passenger vessel where care is already being provided.”

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Foreign-flagged vessels “that loiter beyond U.S. territorial seas” should first attempt to evacuate passengers through their countries, the regulations say. Many of South Florida’s cruise ships are registered in the Bahamas, a country with limited hospital capacity, The Associated Press noted.

Dozens of cruise ships are waiting at Port Miami and Port Everglades or sitting offshore because of the pandemic. Most of the ships are carrying only crew, but Carnival Corp., which owns nine cruise lines, told the Securities and Exchange Commission that it had more than 6,000 passengers on undocked ships.

Officials in Florida have been debating whether Carnival’s Holland America cruise ships, the Zaandam and Rotterdam, that hold a combined 300 Americans could dock at Port Everglades. Four people have died on the Zaandam, with two deaths being attributed to COVID-19, and nine have tested positive for coronavirus.

Florida Gov. Ron DeSantis Ron DeSantisFirst death reported from Hurricane Sally in Alabama Trump tells Gulf Coast residents to prepare for 'extremely dangerous' Hurricane Sally Polls show trust in scientific, political institutions eroding MORE (R) has been hesitant about letting the cruises unload in his state, saying it “doesn’t make a whole lot of sense.” But President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE said he would speak to the governor to “do what’s right … for humanity,” according to the AP.

The Coast Guard will determine if a medical evacuation is necessary, and cruise lines are responsible for on-shore transportation and hospital beds.