Beijing municipal education authorities on Thursday required the city's middle schools not to organize online lessons or assign homework to non-graduating students.

Assignments, such as daily online check-in and uploading self-study videos, also are prohibited, said a notice released by the leading group of epidemic prevention and control of Beijing educational departments.

The official Weibo account of the Beijing Municipal Education Commission on Wednesday also denied a rumor that universities and middle schools in Beijing would open on April 6 and primary schools and kindergartens would open on April 20.

"Epidemic prevention and control is still the top priority as the capital is facing new challenges of imported cases," the Weibo announcement said.

"It is a vital period in the fight against the epidemic, and we cannot ignore any detail. The school opening time will be set according to the development of epidemic control and progress."