South Korea has reported 27 new cases of the coronavirus, including 21 from the densely populated Seoul metropolitan area, where officials have been scrambling to stem transmissions linked to club-goers and warehouse workers.
The figures announced by South Korea's Centers for Disease Control and Prevention on Sunday brought national totals to 11,468 cases and 270 deaths. Twelve of the new cases were linked to international arrivals.
South Korea was reporting about 500 new cases per day in early March but had seemed to stabilise its outbreak with aggressive tracking and tracing, which allowed authorities to ease social distancing guidelines.
But cases in the greater capital area have been rising steadily again since May amid increased public activity, causing alarm as millions of children have begun returning to schools.
On Saturday, KCDC senior official Kwon Jun-wook said at least 108 infections were linked to workers or visitors at a warehouse of local e-commerce giant Coupang, which has seen orders spike amid the epidemic.
Around 270 other infections have been linked to nightclubs and other entertainment venues, which saw huge crowds in early May amid the relaxed atmosphere on social distancing.
Australian Associated Press