South Korean health authorities are investigating a small but growing coronavirus outbreak centered in a handful of Seoul nightclubs, seeking to keep infections in check as the country moves to less restrictive social distancing measures.

The Korea Centers for Disease Control and Prevention (KCDC) said on Friday at least 15 people have confirmed cases of the virus linked to the clubs in Itaewon, a neighborhood popular with Koreans and foreigners in the city.

South Korea has reported only a handful of cases in recent days, the majority of them in people arriving from overseas. The nightclub infections, while still limited, are expected to increase, and come at a time when the country has eased some social distancing restrictions.