Visitors take pictures in front of a wire fence, where ribbons with messages wishing for the reunification of the two Koreas and national flags hang, at the Imjingak Pavilion near the border village of Panmunjom, which has separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Tuesday, March 12, 2013. North Korea's young leader urged front-line troops to be on "maximum alert" for a potential war as a state-run newspaper said Pyongyang had carried out a threat to cancel the 1953 armistice that ended the Korean War. (AP Photo/Lee Jin-man)