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.
The US Center for Disease Control (CDC) said "travellers should avoid all travel" to the country, warning that in the "current situation in Japan even fully vaccinated travellers may be at risk for getting and spreading" Covid variants.
