South Korea’s President Park Geun-hye urged the international community and the UN Security Council (UNSC) for tougher sanctions against North Korea, during an emergency National Security Council (NSC) meeting held Wednesday.

Park’s statement came in response to a fourth North Korean nuclear test, which the North’s media claimed was a successful detonation of a hydrogen bomb.

“North Korea has pushed on with their fourth nuclear test despite the continued warnings from South Korea and the international community, while ignoring the UN mandate against the country’s further nuclear tests,” Park said in comments reported by South Korean media.

“We have repeatedly warned North Korea