SEOUL: North Korea is getting ready to blow up roads that cross the heavily militarised border with South Korea, Seoul said on Monday, amid an escalating war of words after the North accused its rival of sending drones over its capital Pyongyang. North Korean troops were working under camouflage on the roads on its side of the border near the west and east coasts that are likely preparations to blow up the roads, possibly as early as on Monday, South Korea’s military spokesman said.