China has placed a third city under lockdown today to tackle Covid-19 cases, with around six million people now under orders to stay home as Beijing chases zero cases before the upcoming Winter Olympics, AFP reports.

The resurgence prompted officials this week to lock down Lanzhou city — with a population of over four million — and Ejin in the Inner Mongolia region.

After confirming one new case, authorities in Heihe in Heilongjiang province followed suit today, ordering people to stay at home and forbidding residents from leaving the far northern city except in emergencies, according to a local government statement.