AP_Korea_140331_DG_16x9_992SEOUL, South Korea (AP) — North and South Korea fired hundreds of artillery shells into each other’s waters Monday in a flare-up of animosity that forced residents of five front-line South Korean islands to evacuate to shelters for several hours, South Korean officials said. The exchange of fire into the Yellow Sea followed Pyongyang’s sudden announcement that it would conduct live-fire drills in seven areas north of the Koreas’ disputed maritime boundary. North Korea routinely test-fires artillery and missiles into the ocean but rarely discloses those plans in advance. The announcement was seen as an expression of Pyongyang’s frustration at making little progress in its recent push to win outside aid. More