Kim Jong Un made stern assessment saying that it was a serious accident and criminal act caused by absolute carelessness, irresponsibility and unscientific empiricism which is out of the bounds of possibility and could not be tolerated,

North Korea began a full-scale investigation into an accident that damaged a new warship at its launch ceremony this week, state-run media reported Friday, with investigators vowing that those culpable "can never evade their responsibility for the crime.

North Korea says a new 5,000-ton destroyer key to its naval advancement was damaged during its launching ceremony attended by leader Kim Jong Un.