The head of the Japan Medical Association called on Tuesday for a further expansion of the nationwide coronavirus state of emergency.
Momiji Nishiya made history on Monday by winning the first-ever gold Olympic medal for the women's category of street skateboarding.
The Tokyo Olympics, postponed last year because of the Covid-19 pandemic, kicked off on Friday with the opening ceremony.
Japan will proceed with the Tokyo 2020 Olympics despite concerns raised by Japanese health officials and delayed vaccination effort.
The Tokyo Olympics appeared to be on even shakier ground as Japan extended a state of emergency eleven weeks before the Games.
The International Olympic Committee (IOC) kicked off on Wednesday the final countdown to the Olympic Games Tokyo 2020 this summer.