BEIJING — China’s Hebei province is enforcing stricter control measures following a further rise in coronavirus cases in the province, which is adjacent to the capital Beijing and is due to host events for next year’s Winter Olympics.

The National Health Commission on Wednesday reported 20 more cases had been detected in Hebei, bringing the province’s total to 39 since Sunday.

The province’s top official said Tuesday that residents of areas classified as medium or high risk, primarily neighborhoods in the cities of Shijiazhuang and Xingtai, were being tested and barred from going out.

People in neighborhoods ranked as medium risk can leave only if they show a negative virus test. Classes are shifting to online learning and school dormitories placed on lockdown.