YEONCHEON, South Korea, Sept. 6 (Yonhap) -- North Korea has suddenly released a massive amount of water from a dam near the demilitarized zone last week, causing hundreds of millions of won in flood damages in the northern part of South Korea's Gyeonggi Province, officials said Tuesday. The officials said the North opened the gates of its April 5 Dam on the Imjin River on Friday without prior notice to the South, raising the water level of the border river to a near-flood level of 3.96 meters, up from the normal level of 1.16 meters in a little over...