SEOUL, South Korea (AP) — North Korea confirmed Thursday that its recently revised constitution defines South Korea as “a hostile state” for the first time, two days after it blew up front-line road and rail links that once connected the country with the South.

North Korean state media said on Wednesday around 1.4 million young people had applied to join or return to the army this week, blaming Seoul for a provocative drone incursion that had brought the "tense situation to the brink of war".

North Korea blew up the northern parts of inter-Korean roads no longer in use on Tuesday, South Korea said, as tensions between the two keep rising.