The Shanghai government says it is trying its best to improve the distribution of food and essential goods to locked-in residents, responding to growing public discontent as Covid-19 curbs stretch into the 11th day.

China's financial hub has fallen largely silent after the city imposed harsh movement restrictions to stem the spread of Covid-19, with only healthcare workers, volunteers, delivery personnel or people with special permission allowed on the streets.

Authorities say that has whittled the number of couriers, who must keep the city's 26 million residents supplied, to just 11,000.

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