For more:
https://news.cgtn.com/news/2021-06-30/Japan-Olympic-chief-says-no-way-to-ensure-zero-virus-cases-11vVpkajj6U/index.html

Japan's Olympic chief said on Monday there was "no way" to ensure zero COVID-19 cases among teams arriving for the Tokyo Games, as officials prepare to tighten screening procedures.

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