A person receives a nucleic acid test in Beijing in February. Photo: VCG

Beijing reported seven local COVID-19 cases from Monday to 4 pm Tuesday, and will uphold its dynamic zero-case policy to curb the virus' spread with the fastest, most precise prevention and control measures, as imported cases from abroad and outside Beijing remain the biggest risk of the epidemic in the capital, the local authorities said on Tuesday.

With negative nucleic acid test proof within 48 hours and green codes needed, personnel returning to or arriving in Beijing are also required to take another nucleic acid test within 72 hours upon their arrival in Beijing,  Pang Xinghuo, deputy director of the Beijing center for disease control and prevention, said at Tuesday's press briefing.

Pang asked residents to not leave Beijing unless necessary, not travel or take business trips to high- or medium- risk areas and not participate in large-scale inter-provincial training or meetings.  

Among the local confirmed cases, there was one family cluster. Two children from one family tested positive for COVID-19 in the preliminary screening in Chaoyang district of Beijing on Monday. Their residential community was put under closed-loop management starting from Tuesday, according to local authorities. 

Another two family members were also confirmed as COVID-19 patients — one is the children's mother and the other is the children's grandmother. The grandmother returned to Beijing from outside the city on February 28, and the original place she lived was classified as medium-risk for COVID-19, according to the authorities.