The Centre for Health Protection (CHP) said on Sunday that four more customers of a restaurant in Yuen Long have tested positive for Covid-19, raising the number to eight.
Officials said the latest infected customers, aged between 56 and 67, had breakfast at Peony Golden Court restaurant last Sunday, around the same time as the four previous cases.
Dr Albert Au of the CHP said seven of them were triple-jabbed, while the eighth has received two doses of vaccine.
He said all of them had mild or no symptoms.
Around 190 customers of the Yuen Long restaurant have been ordered to undergo mandatory Covid screening.
Au said authorities have the capacity to carry out more in-depth epidemiological investigations now that the pandemic situation is easing.
"As the number of new infections drops, we hope to strengthen contact tracing work and enhance infection control at places where coronavirus outbreaks were reported in order to cut off virus transmission chains in the community," he said.
The total number of new coronavirus cases in Hong Kong on Sunday dropped to 266 from 278 the day before, with 112 confirmed via PCR tests and the rest reported by people who took self-tests. Among them were 23 imported infections.
Health officials also recorded two more deaths, taking the tally in the fifth wave of the pandemic to 9,133.
General Covid-19 situation: https://www.coronavirus.gov.hk/eng/
Covid-19 testing: https://www.communitytest.gov.hk/en/
Community testing notices: https://bit.ly/3ivX2Ce
Community Clinics for Covid-19 patients: https://bit.ly/3q3tz6G
RAT reporting platform: https://www.chp.gov.hk/ratp/
Vaccination programme: https://www.covidvaccine.gov.hk/sen/
Vaccination pass scheme: https://www.coronavirus.gov.hk/eng/vaccine-pass.html
Hotline for Covid-positive patients: 1836 115