Dhaka, Aug. 24 -- North Korea on Saturday accused the South of firing warning shots at its troops near the border, saying it risked raising tensions to "uncontrollable" levels.

The confrontation happened on Tuesday as North Korean soldiers were working to permanently seal the heavily fortified border that divides the peninsula, state media outlet KCNA said, citing a statement by Army Lieutenant General Ko Jong Chol.

Calling the incident a "serious provocation", Ko said that South Korea's military used a machine gun to fire more than 10 warning shots towards the North's troops.

"This is a very serious prelude that would inevitably drive the situation in the southern border area where a huge number of forces are stationing in confrontation...