Tokyo's Olympics chief said Friday that Japan was committed to holding a safe games this summer, as a surge in COVID-19 cases prompted an expansion of contagion controls and with fresh calls for the games to again be postponed or canceled.

The government is set to expand quasi-emergency measures to 10 regions as a fourth wave of infections spread, casting more doubt on whether the Olympics can be held in Tokyo in fewer than 100 days.

"We're not thinking of canceling the Olympics," Tokyo 2020 President Seiko Hashimoto said, speaking on behalf of the organizing committee.