A serious accident occurred on Wednesday during the launch of a new North Korean warship while Kim Jong Un was attending the event, with the isolated state's leader calling it a "criminal act" that could not be tolerated,

Pyongyang has carried out frequent missile tests in violation of United Nations Security Council sanctions and continues to build out its nuclear weapons program. The Kim Jong Un regime insists both are necessary for self-defense, citing "provocations" by the U.S. and its allies.