“Checking the health of the passengers and crew is our priority, while we will also do all possible to prevent any spread of the infection,” Prime Minister Shinzo Abe told parliament. “The remaining passengers and crew will not be allowed to come ashore for the time being.”

A similar number of people are under quarantine aboard the World Dream after three people infected with coronavirus were found to have been passengers, Hong Kong authorities said. The novel coronavirus first emerged in China’s Hubei province weeks ago, and almost 25,000 cases have been reported.

A male Twitter user in his 30s, who says he is a passenger on the Diamond Princess, has been posting photos and videos purported to be from the inside that include an image of health authorities in protective gear walking gold-carpeted hallways.

No Zumba

“It’s so ironic that the schedule is packed with events until the evening,” he said in a tweet Tuesday night, posting a photo of what would have been the agenda for the next day. A Zumba dance-exercise class had been set for 9:30 a.m., along with Japanese language class at 1:45 p.m., bingo at 4:00 p.m., and ballroom dancing at 8:45 p.m.

However, passengers were told to wait in their rooms Wednesday morning, he said in a direct message to Bloomberg, asking to remain anonymous. Breakfast was served to each room by the staff wearing masks, he tweeted.

Checks were conducted on the Diamond Princess after a passenger from Hong Kong who had been on the ship last month tested positive for the virus.

About half the passengers aboard the ship are Japanese and those infected include two customers from Australia, three from Japan, three from Hong Kong, one from the U.S. and a crew member from the Philippines, the operator said.

The infections aboard the ships come as 23 people were, separately, already confirmed to have contracted the disease in Japan.

Princess said its ship would go out to sea before docking at Yokohama to take on provisions. Abe told reporters Wednesday evening that medical personnel will be dispatched to the quarantined liner.