South Korea's daily new coronavirus cases stayed in the 600s for the third consecutive day Saturday as health authorities ramp up their vigilance amid growing concerns over a looming fourth wave of the COVID-19 pandemic. The country reported 658 more COVID-19 cases, including 630 local infections, raising the total caseload to 113,444, the Korea Disease Control and Prevention Agency (KDCA) said. It added four more deaths, raising the total to 1,794. Saturday's daily caseload was down from 673