Shanghai has begun a series of four-day lockdowns in the city following a significant outbreak of Omicron cases.
Restaurants, school and most public places in the city remain closed.
Since Sunday, there has been a four-day lockdown and mass testing of Pudong in east Shanghai, which will be followed by a similar four-day lockdown in Puxi in west Shanghai from 1 April.
The Foreign Office warned that medical and other services are disrupted as a result. Public transport and non-essential private travel are suspended and all river tunnels connecting the eastern and western halves of the city are closed.
All regular commercial flights between the UK and mainland China remain suspended.