South Korea fired warning shots over the weekend when dozens of North Korean soldiers crossed the border line in the DMZ, the South reported on Tuesday. The group immediately returned to the North when the shots were fired. The incident happened on Sunday afternoon when a group of North Korean soldiers was working in the Demilitarized Zone (DMZ), a heavily-guarded strip of land which separates the two Koreas, with the Military Demarcation Line in the middle. South Korea’s Joint Chiefs of Staff told Yonhap that 20 to 30 North Korean soldiers crossed the Military Demarcation Line within a short …