Xi'an upgrades epidemic control and prevention measures (2)

Aerial photo taken on Dec. 28, 2021 shows the empty Great Tang All Day Mall in Xi'an, capital of northwest China's Shaanxi Province. Authorities in Xi'an have upgraded epidemic control and prevention measures starting Monday, ordering all residents to stay indoors and keep away from gatherings except when taking nucleic acid tests. (Xinhua/Tao Ming)