This brought the death toll among the people who boarded the ship to 10, according to the Kyodo news agency. The latest victims were reportedly Japanese citizens.
Japan has strengthened measures aimed at curbing the import of COVID-19, asking all entrants from the United States to self-isolate for 14 days upon returning, Prime Minister Shinzo Abe said earlier in the day.
The cruise ship was quarantined near the Japanese port of Yokohama in early February after a passenger tested positive for COVID-19 after disembarking in Hong Kong.
As of Monday, the coronavirus pandemic has infected nearly 340,000 people and killed over 14,700 worldwide. Nearly 100,000 have recovered.
Japan’s Foreign Ministry late last week raised the travel warning to the United States to the second of a four-level scale, urging its citizens to avoid all non-essential travel.