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.

"We will continue to do what we can to implement a thorough safety regimen that will make people feel complete safety."

Economy Minister Yasutoshi Nishimura earlier told reporters the government was considering adding Aichi, Kanagawa, Saitama, and Chiba to six other prefectures already under contagion controls, including the cities of Tokyo and Osaka.

Japan's top health experts have acknowledged that the COVID-19 pandemic has entered a fourth wave.

Daily cases in Osaka reached a record 1,208 on Thursday, driven by a virulent British strain of the virus. New infections rose to 729 in Tokyo, the most since early February when most of the nation was under a state of emergency.

Almost two-thirds of Japanese said the Olympics should be canceled or postponed, a Jiji news poll showed Friday.

A senior ruling party official said Thursday that canceling this year's Olympics remains an option if the coronavirus situation becomes too dire.

A scaled-back torch relay is already underway. Overseas fans have been barred from the games and officials say that domestic fans may be kept out too.

Olympic and government officials have said further postponement of the games is out of the question.

But a groundswell of health experts have said it's too risky to hold the games this summer. Compounding the problem is Japan's relatively slow inoculation push, which began February using imported vaccines.

Japan has exhibited "poor performance" in containing virus transmission, along with limited testing capacity and a slow vaccination rollout, according to the commentary published in the British Medical Journal on Wednesday.

"Plans to hold the Olympic and Paralympic games this summer must be reconsidered as a matter of urgency," wrote lead author Kazuki Shimizu of the London School of Economics.

"Holding Tokyo 2020 for domestic political and economic purposes — ignoring scientific and moral imperatives — is contradictory to Japan's commitment to global health and human security."

A survey of more than 1,000 Japanese doctors last month showed that 75% believed it was better to postpone the games, according to physician referral company Ishinotomo.

Professor Hiroshi Nishiura of Kyoto University, who is an advisor to the government on pandemic response, urged in a magazine commentary this week for authorities to postpone the Olympics by a further year to allow for more time to vaccinate the public.

The nation began its inoculation push in February, later than most major economies. Only 0.9% of the public in Japan have received their first shot so far, compared with 2.5% in South Korea and 48% in the United Kingdom.

The government denied reports last week that it would prioritize athletes for vaccination. Australia is one nation considering such a move.

Prime Minister Yoshihide Suga said Thursday the government would do "everything possible" to prevent further spread of the contagion ahead of the games, after a ruling party official said canceling the event remained an option.

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