BEIJING (REUTERS) - China on Saturday (April 11) reported a rise in new coronavirus cases, as authorities try to head off a second wave of Covid-19, particularly from imported and asymptomatic infections, as city and travel restrictions are lifted.

The National Health Commission said 46 new cases were reported on Friday, including 42 involving travellers from overseas, up from 42 cases a day earlier.

The commission said in a statement that 34 new asymptomatic coronavirus cases were reported, down from 47 the previous day.

Mainland China's tally of infections now stands at 81,953. The death toll rose by three to 3,339.

Tough curbs imposed since January helped rein in infections sharply from the height of the pandemic in February. But policymakers fear a second wave triggered by arrivals from overseas or asymptomatic patients.

North-eastern Heilongjiang recently reported a spike in new cases because of Chinese nationals entering the province from Russia, which has seen a surge of cases.

Provincial health officials said it had 22 new imported cases on Friday, all Chinese nationals coming from Russia, and one new local case, in its capital of Harbin.

Inner Mongolia had a daily tally of 27 new imported cases by Saturday morning, all from Russia, the region's health authority said.

The central province of Hubei, where the virus emerged late last year, reported no new cases for a seventh successive day.

Since the epidemic broke out in the provincial capital of Wuhan, it has spread around the world, infecting 1.6 million people and killing more than 100,000.