BEIJING,  Jan. 16 (Xinhua) -- Beijing has required inbound travelers to undergo  health monitoring for seven additional days following 21 days of medical  observation, authorities said Saturday.

The  latest requirement was announced following the meeting of the city's COVID-19 prevention and control leadership group held on Friday.

The  anti-epidemic management at the centralized quarantine venues will be  further strengthened and nucleic acid tests targeting related personnel  and surroundings will be conducted more frequently, according to the  meeting.

Recently,  there have been cases in Beijing and other cities across the country in  which inbound travelers were confirmed as COVID-19 patients after 14  days of isolated observation, which led to a rebound in indigenous  cases.

In  response to the problem, Beijing earlier this month extended the  COVID-19 observation period for inbound travelers to 21 days following  sporadic locally transmitted cases.