China locks down city of 9 million and reports 4,000 cases as Omicron tests zero-Covid strategy

City of Shenyang has barred residents from leaving without a 48-hour negative test result and put all housing compounds under closed management'

• See all our coronavirus coverage

China has locked down an industrial city of 9 million people overnight and reported more than 4,000 virus cases, as the nation's zero-Covid" strategy is confronted by an Omicron wave.

Health authorities reported 4,770 new infections across the country on Tuesday, the bulk in the north-eastern province of Jilin, as the city of Shenyang in neighbouring Liaoning province was ordered to lock down late Monday.