Health officials said they tested 720 residents at Block C of Pik On House, Yue On Court on Ap Lei Chau's Yue On Court Road and 490 at the Mei Sun Building on Kau Hui Chik Street in Tai Po.

In North Point, around 590 residents of Block 3, Phase 1 of City Garden on Electric Road were checked. Just 15 residents of a building at Fung Fai Terrace in Happy Valley required testing.

At Ma On Shan, some 1,520 people were tested at Kam Huen House (Block F), Kam Fung Court on Sai Sha Road.

The lockdowns were triggered after people who lived in each of the buildings tested preliminary positive for a mutant coronavirus strain.

The lockdowns were lifted at around 7am this morning. Authorities also reminded that people who stayed in any of the buildings for more than two hours are required to take a test by Saturday.