North , South Korea exchange fire after North opens up on balloons with anti-aircraft guns . The balloons carried leaflets critical of the North , South Korean Defense Ministry says . The exchange comes amid continuing speculation over the fate of the North 's missing leader . After a warning , South Korea responded with a 40 rounds from a heavy machine gun , the ministry said . Comment:
North , South Korea exchange fire after North opens up on balloons with anti-aircraft guns . The balloons carried leaflets critical of the North , South Korean Defense Ministry says . The exchange comes amid continuing speculation over the fate of the North 's missing leader . Comment: