DALIAN -- Dalian, a port city in Northeast China's Liaoning province, classified another four areas as medium-risk COVID-19 zones on Dec 30, according to local health authorities.

Two neighborhoods in Jinpu New District, one neighborhood in Shahekou district, and one in High-tech District were identified as medium-risk areas, health authorities told a press briefing on epidemic prevention and control.

Currently, the city has a total of 16 medium-risk COVID-19 areas.

On Tuesday, Dalian reported three local COVID-19 cases and three new asymptomatic cases.