The US has issued a travel warning for Japan over the country's Covid-19 surge, amid heightened scrutiny just weeks before the Tokyo Olympics.But US Olympic officials have said they are confident their athletes will be able to take part safely in the Games.
Japan already bans most travellers from entering the country.
It long had low numbers of Covid cases but is now seeing a fresh wave of infections pushing the healthcare system in some cities to its limit.
Japan has recorded more than 700,000 infections and 12,000 Covid-19 deaths from the virus.
Despite the growing crisis, the Tokyo Olympics are still scheduled to go ahead on 23 July after having been postponed from last year.