Following an increase in COVID-19 cases, Chinese authorities have shut down Chengdu, a city of 21 million people in the southwest.
Residents of the city, a major transit hub in Sichuan province and a hub of administration and commerce, have been told to stay at home, and over 70% of flights to and from the city have been cancelled.
Although the start of the new school year has been postponed, public transportation is still in operation, and residents are still allowed to leave the city if they can prove that they have a specific need.
Only one member of each family who can demonstrate a recent virus test that was negative is permitted to leave the house to make daily purchases under the regulations that were published on Thursday.
Millions of residents in the northeastern city of Dalian and in Shijiazhuang, the capital of the Hebei province that borders Beijing, have been forced to remain in their houses as a result of similar measures.
The virus, which was discovered for the first time in the central Chinese city of Wuhan in late 2019, is said to be prevented from spreading further by the measures, according to China. People's behaviour in regards to employment, consumption, and travel have all been greatly restricted by the dread of being placed in a lockdown situation or sent to a quarantine centre for even being close to someone who tested positive.
With lockdowns, business closures, and mandatory mass testing, Chengdu has reported about 1,000 cases in the most recent outbreak. There have been no deaths from the most recent round of domestic transmission, but the extreme measures reflect China's strict adherence to its "zero-COVID" policy, which has had a significant negative impact on the economy.