Three preliminary positive cases have been found in the overnight lockdown in Fanling imposed by health authorities.
Health officials found three positive Covid
cases during an overnight lockdown in Wah Koon House of Wah Sum Estate after testing about 1,720 people.
Meanwhile, the test result for one of the residents remained indeterminate.
Health officials visited 680 households door-to-door during the operation and about 85 of them didn't answer.
The government said the Centre for Health Protection will take follow-up action.
Households that didn't answer the door are urged to contact health officials as soon as possible.