Tung Moon House in Tai Hang Tung Estate in Sham Shui Po was locked down after “a couple of positive cases” involving a mutant strain.
Officials said they expected it to be completed by 7am on Wednesday.
Separately a group of villas in Tai Po is also in overnight lockdown.
Health officials said they sealed off Serenity Villa in Tai Po Tau for mandatory testing after sewage samples came back positive for the coronavirus.
“As the sewage discharged from the building tested positive for Covid-19, it is suspected that there are asymptomatic patients in the building,” a government spokesman said.
Officials expect to finish the operation by 9am on Wednesday.
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Last updated: 2022-02-01 HKT 20:49