Singapore on Saturday reported a record of 942 new Covid-19 cases, a “vast majority” of them linked to packed dormitories that house foreign workers, including several Indians.

Around 300,000 low-wage workers, mostly from South Asia, work in Singapore in construction and maintenance.

Most of them live together in huge dormitory complexes on the outskirts of the city they have helped build.

“We are still working through the details of the cases,” said the ministry of health (MOH).

A large proportion of Singapore’s Covid-19 cases can be traced to foreign worker dormitories, which have seen a surge in confirmed cases recently. Thirteen such dormitories have been isolated to prevent the spread of the virus.

Only 14 of the new cases are Singaporeans and permanent residents.

The MOH on Friday also expressed concern over unlinked cases of Covid-19, saying that tests on a sample of individuals at primary care facilities have picked up several positive diagnoses, which indicate “undetected cases in the community”.

“We are particularly concerned that it is increasingly difficult to link the new cases and identify the source of infection,” said the ministry.

“In fact, the number of unlinked cases in the community has increased slightly, from an average of 19 cases per day in the week before, to an average of 22 per day in the past week.”

The average number of new cases per day in the community dropped to 32 over the past week, from 40 the week before.

To date, 11 people have died from Covid-19 related complications in Singapore.

Saturday’s new cases takes the total in the city-state, which is under a partial lockdown, to 5,992.