More than 8,000 people have been quarantined in and around the Chinese city of Shulan, in the northeastern province of Jilin, according to state media.
Shulan is one of a number of places across China -- including Wuhan, where the coronavirus was first detected late last year -- to report new cases since the country gradually began reopening this month.
Last week, the city initiated "wartime measures" to fight the new infections. National level health and inspection teams have been dispatched to the area. According to state media, the city's Communist Party chief, Li Pengfei, has also been sacked.
Speaking to state media during a tour of Jilin Saturday, Chinese Vice Premier Sun Chunlan called for "more decisive, precise, flexible and effective measures in regular epidemic prevention and control to avoid further spread of the Covid-19 outtbreak."
Chinese health authorities said Sunday that there were five new confirmed coronavirus cases Saturday, two of which were imported.
The three other cases were the result of domestic transmission and all were reported in Jilin province, the National Health Commission said.
There have been over 84,000 cases of the coronavirus in China since the pandemic began, according to a tally from Johns Hopkins University. More than 4,600 people have died as a result of the virus in China.