South Korean forces did not damage North Korean military assets when they returned fire on Thursday, Pyongyang’s main TV station said during a Friday “Korean People’s Army (KPA) Supreme Command Emergency Report” broadcast.

Describing the South Korean response as being “without probable cause,” the outlet added that Seoul “still has no idea” what type of ammunition the North fired, “yet proceeded to shoot artillery rounds at us.”

The state news channel went on to criticize South Korea for committing an “unforgivable” and “grave provocation against DPRK forces,” also warning that it should now be aware of increasing “military anger.”

The development comes as Kim Yang Gon, Pyongyang’s official responsible for inter-Korean relations, wrote Thursday to his