More countries suspend UK flights amid concern over highly infectious new COVID-19 strain (15)

A woman wearing a face mask walks past a closed shop on Oxford Street in London, Britain, on Dec. 21, 2020. On Sunday, British Health Secretary Matt Hancock warned that the new strain of COVID-19 is "out of control" in Britain, urging Britons to behave as if they already have the virus, especially in areas under the new Tier Four restrictions. (Xinhua/Han Yan)