There are reports today that Wuhan will test all 11 million residents in what it is calling 10 days of mass battle as a new cluster of coronavirus cases, rears its head.

Reuters reports that each of the city’s districts will be required to create a testing plan by today.

Wuhan, where the world’s first coronavirus cases were reported in late December, eased many restrictions in early April after a strict lockdown. But earlier this week,¬†authorities found at least six new cases, the first to be confirmed in Hubei province in more than a month.

Now the city will test all of its residents over a 10-day period.