China’s Wuhan on Monday reported its first coronavirus cluster since a lockdown on the city was lifted a month ago.

“At present, the task of epidemic prevention and control in the city is still very heavy,” the Wuhan health authority said in a statement.

Wuhan reported five new confirmed cases, all of whom live in same residential compound. One of them is the wife of an 89-year-old male patient reported a day earlier in the first confirmed case in the city since April 3.