Six South Koreans were missing near the border with the North, after a sudden rise in a river possibly due to water released from a dam in the North, a fire and rescue official said on Sunday, according to Reuters. "North Korea likely released water from its dam in the Imjin River," said an official at a fire station in Yuncheon, a town in northern Gyeonggi province just south of the border. "Six people are missing and the search and rescue operation is under way," he said, adding another 10 were rescued. Imjin River is one of several flowing from the North to the South.