(BEIJING, China) — A cluster of COVID-19 cases in Beijing has prompted authorities to test millions and impose new measures two weeks ahead of the opening of the Winter Olympics, even as the city of Xi’an in north-central China lifted on Monday a monthlong lockdown that had isolated its 13 million residents. Officials in Beijing said they would conduct a second round of mass testing of the Fengtai district’s 2 million residents, where the majority of the capital’s 40 coronavirus cases since Jan.