SEOUL, Oct 15 (Reuters) - North Korea blew up sections of inter-Korean roads and rail lines on its side of the heavily fortified border between the two Koreas on Tuesday, prompting South Korea's military to fire warning shots.

Pyongyang said last week it would cut off the inter-Korean roads and railways entirely and further fortify the areas on its side of the border as part of its push for a "two-state" system scrapping its longstanding goal of unification.

At around midday on Tuesday, some northern parts of road and rail lines connected to the South were destroyed, the South's Joint Chiefs of Staff (JCS) said.