South Korea will impose stricter social distancing rules for the greater Seoul area a month after easing them, officials said Tuesday, warning of an even bigger crisis if anti-COVID-19 efforts fail to dampen a spike in new cases.

Starting Tuesday midnight, tighter curbs will ban public gatherings of 100 people or more, limit religious services and audiences at sporting events to 30% capacity, and require high-risk facilities including clubs and karaoke bars to broaden distance among guests.

South Korea has been one of the world's coronavirus mitigation success stories after tackling the first major COVID-19 epidemic outside China with aggressive tracing and testing, but continues to battle persistent rises in infections.