Singapore has detected its first locally transmitted case of the Covid-19 variant Omicron in a member of staff at the city state's airport, authorities said, warning that more Omicron cases are likely to be detected.

The 24-year-old Singaporean woman, who works in a service role in the airport, “may have interacted with transit passengers from Omicron-affected countries,” the health ministry said in a statement, according to AFP.

She tested preliminarily positive for Omicron as a part of the routine testing for frontline workers, it said, noting she was fully vaccinated and asymptomatic.