The powerful sister of North Korean leader Kim Jong Un on Thursday dismissed South Korean claims the North is removing some of its loudspeakers along the inter-Korean border, mocking the government in Seoul for clinging to hopes of renewed diplomacy between the war-divided rivals.

The North Korean leader's powerful sister Kim Yo Jong said peace overtures being made by South Korea's new liberal government were "deception" and denied Pyongyang had taken reciprocal action, state news agency KCNA reported on Thursday.

She holds no known official title in North Korea. The outside world has never heard her voice. The North’s state media has not even named her, referring to her only as the “most beloved,” “respected” or “dear” daughter of its leader.