South Korea has reported 686 new cases of the coronavirus, tying its second-highest daily jump since the emergence of the pandemic, as a resurgence driven by the greater capital area threatens to erase hard-won gains against the virus.

The Korea Disease Control and Prevention Agency said that 536 of the new cases were reported in the Seoul metropolitan area, where new clusters of infections have been popping up from seemingly everywhere, including restaurants, markets, saunas, hospitals, long-term care facilities and army units.

According to AP, the country’s caseload is now at 39,432, including 556 deaths. The agency said 149 among 8,699 active patients were in serious or critical condition.