Koreas Exchange Fire in Disputed Waters South fires back after shells land near Yeonpyeong island By Rob Quinn, Newser Staff Posted Aug 10, 2011 3:42 AM CDT 0 comments Comments South Korean warships move unison during an exercise off Yeonpyeong Island. (AP Photo/Yonhap, Kim Ju-sung) (Newser) – Artillery fire has once again been exchanged around the disputed maritime border between North and South Korea. The South Korean military says it fired three artillery rounds into North Korea waters after three shells from the North landed close to the border, Bloomberg reports. The military says it wasn't aware of any exercises and it isn't sure what prompted fire from the North. The blasts took place near Yeonpyeong island, where a North Korean artillery attack killed four people last November.