Meanwhile, with just 11 weeks left for the Tokyo Olympic Games, Japan extended a state of emergency in Tokyo, Osaka, Kyoto and Hyogo until the end of May to stem a surge in novel coronavirus cases.
However, Prime Minister Yoshihide Suga reiterated that it was still possible to host the Tokyo Games just months away.
It means that the International Olympic Committee Head Thomas Bach’s visit to Tokyo ahead of the Olympics could be delayed.
Bach was expected to attend a torch relay ceremony in the western city of Hiroshima on May 17.
With Japan is in the list of one of the least vaccinated nations, about 616,000 cases including about 10,500 deaths have been reported since the pandemic began.