South Korean soldiers stand guard at a traffic control gate near the truce village of Panmunjom, in the demilitarized zone that separates the two Koreas, in Paju, north of Seoul, South Korea, Saturday, Oct. 6, 2012. A North Korean soldier killed two of his superiors Saturday and defected to South Korea across the countries' heavily armed border in a rare crossing that prompted South Korean troops to immediately beef up their border patrol, officials said. (AP Photo/Bae Jung-hyun, Yonhap)