SEOUL (Reuters) -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.

SEOUL: Dynamiting inter-Korea roads and railways. Threatening war over drone incursions. Moving nuclear-capable weapons to the border. North Korea appears very unhappy with the South at the moment -- but why?

North Korea says South Korea flew propaganda-dropping drones over its capital city, warning the "safety lock on our trigger has now been released" in response.

North Korea said its army units are prepared to launch strikes against South Korea if another drone carrying propaganda flyers flies into the country.

Tensions in the Korean peninsula are rising as the US presidential campaign enters the home stretch.

The North Korean government detonated explosives on cross-border roads connecting its country to South Korea on Tuesday in response to alleged drone incursions into its territory. South Korean military officials expected the detonation,

North Korea blew up a section of inter-Korean roads and rail route on its side of the border between the two Koreas, prompting South Korea's military to fire warning shots. NBC News' Janis Mackey Frayer reports on the rising tension between the two countries.

North Korea blew up sections of roads in its own territory that are part of links once used to connect the southern part of the peninsula with the north, in a show of defiance after it accused Seoul of flying drones over Pyongyang.

In a move that underlines North Korea's growing anger with South Korea, North Korea has blown up sections of unused rail routes and roads that once connected the two countries.