Wuhan, where the global coronavirus epidemic first started, has ordered officials to prepare to test its entire 11 million population after the central Chinese city reported a handful of new infections for the first time since its lockdown was lifted, according to state media reports.

All districts in the city have been told to submit a plan which should lay out how they will prepare within ten days to conduct testing of everyone under their purview, said a document cited by local media reports as being released by Wuhan’s anti-virus department. The plan should prioritize the testing of vulnerable groups and areas like residential compounds, the document said.

Six locally transmitted cases, reported on May 10 and 11, were found in people already under quarantine who were asymptomatic before testing positive, according to the local government. All six cases emerged from a single residential compound and were the first new infections found in Wuhan since its lockdown was lifted on April 8.