Japan is set to expand quasi-emergency measures to 10 regions on Friday as a fourth wave of COVID-19 cases spreads, casting doubt on whether the Summer Olympics can be held in Tokyo.

Economy Minister Yasutoshi Nishimura told reporters that the government was considering adding Aichi, Kanagawa, Saitama, and Chiba to six other prefectures already under the orders, including the metropolises of Tokyo and Osaka. A final decision is expected on Friday afternoon.