North Korea arrests senior official over warship launch failureSatellite images shows the warship lying on its side, in what Kim Jong Un has criticised as a "criminal act"The vessel is being repaired under the guidance of an expert group, KCNA said. North Korea has arrested a fourth official over the failed launch of a new warship that has enraged the country's leader, Kim Jong Un. The commission commands the Korean People's Army and is responsible for developing and implementing North Korea's military policies. "With this new line of ships, North Korea seems to intend on challenging the sovereignty of the South in earnest." Last week's shipyard accident comes weeks after North Korea unveiled a similar warship in another part of the country.