Ningbo, in East China's Zhejiang province, reporting three COVID-19 cases on Monday.
The three cases, all members of one family in Ningbo's Zhenhai district, have been sent to a designated hospital for treatment. Schools in the district were closed on Monday, the local authorities said, and all flights from Ningbo to Beijing were canceled due to pandemic prevention measures.
On Monday morning, the city imposed complete closed-off management on the residential community and businesses in Zhenhai's Jiaochuan subdistrict, where the three infected patients lived and worked.
The local authorities said public places in Zhenhai, such as scenic spots, performance venues, internet cafes and stadiums, had been closed and cultural, tourism and sports activities have been called off.
The Chinese mainland on Monday reported 60 new locally transmitted COVID-19 cases, the National Health Commission said in its daily report on Tuesday.
Of the new local cases, 55 were reported in Inner Mongolia, two each in Heilongjiang and Yunnan and one in Zhejiang.
Also reported were 34 new imported cases in eight provincial-level regions, according to the commission.