South Korea's daily new coronavirus cases stayed over 600 for the fourth straight day Saturday due to outbreaks of cluster infections nationwide as the authorities prepare to announce a new set of eased social distancing rules, Yonhap cited the Korea Disease Control and Prevention Agency (KDCA) as saying. KDCA reported that the country recorded 668 new cases, including 611 local infections, raising the accumulated caseload to 154,457, adding three COVID-19 deaths, raising the death toll to 2,012. The fatality rate came to 1.3 percent. The country's daily infection tally had stayed below the 600 level since June 11, but the number rebounded and has stayed over the mark since Wednesday as new cluster infections involving schools, churches and entertainment facilities pop up across the country. New imported infection cases are also continuing to flow in. The health authorities are on edge in particular over the steady growth in cases of the highly contagious Delta variant of the coronavirus as the country is set to relax its antivirus distancing rules. Since reporting the first local cases of the Delta variant in April, its total caseload had risen to 190 as of June 19.