Rescue workers search for missing people in a vehicle swept away by sudden rising water, partially submerged in the Imjin river near the demilitarized zone separating the two Koreas in Yeoncheon, Sep.7, 2009. South Korean Prime Minister Han Seung-soo on Monday expressed regrets about the DPRK's unannounced discharge of water from a dam, which may have caused the disappearance of six South Koreans. [Xinhua/AFP]