North Korea appears to be preparing to carry out explosions at roads connected to South Korea, South Korea's military said Monday."Following an announcement by the North's Korean People's Army (KPA) on Oct. 9, the North Korean military has been carrying out activities assumed to be linked to explosions on the roads along the Gyeongui and Donghae lines," the Joint Chiefs of Staff (JCS) said.The JCS said it is closely monitoring such activities that are taking place north of the Military Demarcation Line and seeking safety measures for troops and South Korean people.On Wednesday, the KPA said it will cut off all roads and railways connected to South Korea and build "strong defense structures" in the areas in response to South Korea-U.S. military maneuvers.Source: Yonhap News Agency