North Korea's artillery units near the border with South Korea have been ordered to be ready to fire amid frictions over drones that Pyongyang says are being flown over the frontier, state media cited the government as saying on Sunday.

North Korea accused South Korea of flying propaganda-filled drones over Pyongyang and threatened “retaliation,” state media reported Friday.

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.