SEOUL (Reuters) -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, state media KCNA reported. Kim, who witnessed the failed launch of the 5,000-ton destroyer, excoriated the accident as caused by "carelessness" that tarnished the country's dignity, and ordered the ship to be restored before a key ruling party meeting in June, KCNA said on Thursday. The report did not mention whether there were any casualties.