Carnival's Princess Cruises said it has placed 3,700 passengers and crew under mandatory quarantine for two weeks after 10 people aboard a cruise ship in Yokohama, Japan, tested positive for the new coronavirus.

The company said a previous guest, who didn't have any symptoms while aboard the ship, tested positive for the coronavirus on Saturday — six days after leaving the Diamond Princess. The ship was being held in Japan for 24 hours while Japanese health authorities assessed the 3,700 passengers and crew on board.

"These 10 persons, who have been notified, will be taken ashore by Japanese Coast Guard watercraft and transported to local hospitals for care by shoreside Japanese medical professionals," the company said.

The ship will be quarantined for at least 14 days, the company said, as is required by the Japanese Ministry of Health.

"The first phase of health screening of all guests and crew onboard Diamond Princess, by the Japanese Ministry of Health, has been completed," the company said in a statement Tuesday. "We were notified that amongst the samples that have completed testing, 10 people have tested positive for coronavirus."