This report, investigated and written by an international Joint Civilian-Military Investigation Group assembled by the South Korean Ministry of Defense, investigated the March 26, 2010 sinking of a South Korean ship off of North Korea. The report states, "Based on all such relevant facts and classified analysis, we have reached the clear conclusion that ROKS "Cheonan" was sunk as the result of an external underwater explosion caused by a torpedo made in North Korea. The evidence points overwhelmingly to the conclusion that the torpedo was fired by a North Korean submarine. There is no other plausible explanation."
The North Korean government issued this statement, provided here by GlobalSecurity.org.