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China has put one northern city in lockdown and launched citywide coronavirus testing in another, after two local infections involving workers at a port and trade zone respectively, authorities have said.

There was one new case each in Dongning and Suifenhe, which both sit on the country’s border with Russia.

In Dongning, a 40-year-old maintenance worker at a port tested positive on Thursday, triggering the latest measures.

Officials there said on Saturday it would enter “wartime mode” – temporarily suspending public bus services and road transport, while requiring anyone leaving the city to produce a negative Covid-19 test from the preceding 24 hours.

Schools will suspend classes and dine-in will be banned at restaurants, while in higher-risk areas only one member of each household will be allowed to leave the home once every two days to buy daily necessities – for no longer than two hours each time.

In the Suifenhe case, a 39-year-old man who works as a loading and unloading worker at a trade zone tested positive.

Both cities on Friday announced the launch of citywide testing, expected to be completed in three days.