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Beijing is closing all city schools in an effort to prevent a wider COVID-19 outbreak in the Chinese capital.

Home to 21 million, Beijing has already ordered three rounds of mass testing, with the third set for Friday.

Beijing’s Education Bureau ordered all schools to end classes from Friday. The bureau said it hadn’t determined when they would resume.

BEIJING CONDUCTS MASS COVID TESTING, ENFORCES LOCKDOWNS

It was not clear whether the schools would be able to offer virtual classes or allow students taking crucial exams to return.

Students make up more than 30% of total cases in Beijing, with clusters linked to six schools and two kindergartens in the city’s Chaoyang district.