Banners of the Czech Republic (bottom) and the Olympic Refugee teams (top) are seen on a building at the Olympic and Paralympic Village ahead of the 2020 Tokyo Olympics. The Czech team is investigating a cluster of coronavirus cases.
Czech Olympic officials are looking into a cluster of coronavirus cases that are linked to a charter flight that brought a contingent of athletes and staff to Japan. The country's team has six coronavirus cases in total.
A doctor who was on the flight was reportedly among the first to test positive. As of late Thursday, four athletes had also tested positive for the coronavirus.