The government on Saturday night locked down the High Block and Low Block of Shek Chun House at Shek Lei (I) Estate in Kwai Chung after Covid-19 was found in sewage samples there.
The complex was cordoned off at 9pm, and residents will have to get tested by 2am. The operation is expected to end at 1pm on Sunday.
In a statement it said: “As the sewage discharged from the above building was tested positive for Covid-19, it is suspected that there are asymptomatic patients in the building.”
It added the lockdown operation may be extended depending on the test results.