Residents in Anhui province are only permitted to leave their homes if they are getting tested as the region reports 287 new infections.
The lockdown of the city of 26 million comes after the global financial hub reported a record 3,450 new asymptomatic Covid infections and 50 symptomatic cases.
China now facing its worst outbreak since late 2019, officials have vowed to double down on the zero-tolerance strategy to contain the current surge.
Officials are rushing to build makeshift hospitals in some provinces in China as a steep increase in Omicron-led Covid-19 cases continues to spread.
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