Officials say three infected people have been found after Covid tests on almost 900 residents of two housing blocks in Diamond Hill.
The checks were ordered on Saturday after the virus was found in sewage samples from blocks 2 and 3 of Bel Air Heights.
The government said the lockdowns came to an end at around 11am on Sunday.
Meanwhile, the authorities launched another testing operation, locking down Lok Chuen House at Shui Chuen O Estate in Sha Tin.
Officials said they expected to finish the exercise at around 11am on Monday.
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Last updated: 2022-04-24 HKT 16:29