Kim promised to punish those responsible for the “catastrophic failure” after the naval vessel partially capsized during a ceremony attended by the leader.

North Korea has begun a full-scale investigation into the accident that occurred during the launch of a warship earlier this week, state media KCNA reported on Friday. KCNA previously said the incident was caused by a loss of balance while the vessel was being launched and sections of the bottom of the warship were crushed.