Chinese authorities have extended the lockdown of Shanghai to cover all its 25 million people.
There had been separate measures for the eastern and western sides, but the whole city is now subject to indefinite restrictions.
Reported cases have risen to more than 13,000 a day, although the numbers are not high by some international standards.
Residents in some areas of the city said the strict policy meant no-one was allowed to leave their housing compounds, not even to collect essential provisions.