Eleven residential estates in south Beijing have been locked down due to a fresh cluster of coronavirus cases linked to a nearby meat market, officials said on Saturday.
Seven cases have so far been linked to Xinfadi meat market, six of them confirmed on Saturday, officials said. Nine nearby schools and kindergartens have been closed.
Reuters later reported that 45 people out of 517 tested with throat swabs at the market in the city's southwestern Fengtai district hadtested positive for the coronavirus, Chu Junwei, a district official, told a briefing.
The chairman of the Xinfadi meat wholesale market told state-run Beijing News that the virus was detected on chopping boards used to handle imported salmon.
City authorities on Friday closed two markets visited by one of the known cases.
Major supermarket chains including Wumart and Carrefour removed all stocks of salmon overnight in the capital, but said supplies of other products would not be affected, Beijing Daily reported Saturday.
The first new case in Beijing after two months -- who had no recent travel history outside the city -- was reported on Thursday, and authorities confirmed two more infections the next day.
China reported 11 new coronavirus cases on Saturday, including six domestic cases in the capital, that raised concerns about a resurgence.
The majority of China's cases in recent months were overseas nationals tested as they returned home, with the domestic outbreak brought largely under control after the disease first emerged in the central city of Wuhan last year.