At least 10 people on board a cruise ship docked in the Japanese port of Yokohama have tested positive for coronavirus.
According to the BBC, health authorities said almost 300 of the 3,700 people on the Diamond Princess have been tested so far. The number of infected could rise.
The checks began after an 80-year-old Hong Kong man who had been on the ship last month fell ill with the virus.
Some 3,600 people on a second cruise ship docked in Hong Kong are also being tested.
Chinese health authorities are stepping up efforts to control the spread of the virus, with approximately 18 million people in the east of the country now required to stay at home.