Manzhouli, a border city in the Inner Mongolia autonomous region under the jurisdiction of Hulunbuir, reported five new locally transmitted COVID-19 cases on Tuesday, the local government said.

The five — all with mild symptoms — are members of the same family. Two were discovered initially during routine testing, and the others were found in follow-up tracing.

The coronavirus risk level of Nanqu subdistrict was classified as medium on Tuesday, according to a statement released by the city's epidemic prevention and control headquarters.

Residents of Manzhouli were asked not to leave home unless necessary, the statement said. The city has suspended all public transportation services, including flights, trains, long-haul buses and taxis.

No vehicles are allowed to leave or enter the city except for those engaged in transporting goods or involved in epidemic prevention and control, medical aid and emergency rescue.

Public venues in the city, including educational institutions, entertainment facilities and private clinics, suspended services from Tuesday.

Mass nucleic acid testing in Manzhouli, covering all local residents, began at 2 pm on Tuesday.