The president of the Tokyo Organising Committee said Friday organizers have to "tighten" anti-COVID-19 measures after two members of the Ugandan delegation tested positive for the disease following their arrival in Japan.

Seiko Hashimoto's comment came after a Ugandan man in his 50s, who tested positive for the coronavirus after arriving at Narita Airport on Saturday, was found to be infected with the highly contagious delta variant first detected in India.

While the man has no symptoms, according to a health ministry official, a second member was found positive for the virus after traveling to Osaka Prefecture for a pre-Olympic training camp.