Singapore's manpower ministry said authorities were investigating the possibility of Covid-19 re-infections among residents in a migrant workers' dormitory, after finding about a dozen positive cases in the facility, Reuters reported.

Hundreds of residents from the dormitory will be sent to a government quarantine facility, local media reported. Authorities had conducted Covid-19 tests on all residents at Westlite Woodlands Dormitory after a 35-year-old worker was found positive on April 20 as part of routine testing.

The worker had completed his second vaccination dose on April 13. His roommate also tested positive. To date, at least 10 recovered workers were found to be Covid-19 positive.

The more than 1,100 residents from the block where the cases were found will be sent to a government quarantine facility for 14 days, Channel NewsAsia reported on its website, citing a letter from the dormitory operator.