Hong Kong is expected to report more than 1,500 new Covid cases on Saturday, sources have told RTHK.
It would be another record following the 1,325 confirmed infections reported on Friday.
Officials said they identified more coronavirus cases during overnight lockdown operations at buildings on two public housing estates in Sham Shui Po.
In Un Shing House at Un Chau Estate, 23 people were found to have Covid-19 among 1,980 tested, while in Begonia House at the nearby So Uk Estate, nine cases were identified among 1,100 people tested.
Both lockdowns were ordered on Friday night after the virus was found in sewage samples.