The United States track and field team have cancelled their pre-Olympic training camp in Japan over concerns of the coronavirus pandemic.
Tokyo is under a state of emergency amid a surge in cases with less than 10 weeks to the games.
The athletes were due to train in nearby Chiba and the local government said "concerns for their athletes' safety" led to the cancellation.
The US team are yet to comment on the matter but several voices have raised concerns about the possibility of the games taking place. Tennis stars Naomi Osaka, Rafael Nadal and Serena Williams have all said that they are not sure if they will compete in the Summer Games.
A recent poll found that nearly 60% of people in Japan want the Games to be cancelled, a fact that may have been exacerbated by the country's wish to offer donated vaccines to about 2,500 Olympic and Paralympic athletes and support staff to prevent an outbreak during the event.
In Japan, 2.6% of the population has been vaccinated and reports that athletes would be prioritised led to criticism from the public.