South Korea has reported 79 new coronavirus cases, the most since April 5 and the third straight day of rising infections, raising the spectre of a second wave of disease in a country widely praised for containing the initial outbreak.

Reuters quoted Health Minister Park Neung-hoo as saying that at least 69 cases so far this week have been linked to a cluster of infections at a logistics facility operated by Coupang Corp, one of the country’s largest online shopping firms, in Bucheon, west of Seoul.

According to the Korea Centres for Disease Control and Prevention (KCDC), the new cases brought the country’s total as of midnight on Wednesday to 11,344 with 269 deaths.