North Korea declared the investigation after the colonel-level officers talks with UN Command. Officers from North Korea and the UN Command met for 90 minutes at the border village of Panmunjom inside the Demilitarized Zone on Thursday, Jul 15.
South Korean warship ROKS Cheonan sinking occurred on Mar 26 killing 46 South Korean sailors.
An international team of investigators in May 2010 found that a North Korean submarine fired a torpedo that sank Cheonan. The US and South Korea called the sinking a violation of the armistice that ended the fighting in 1953.
The UN Command also conducted a separate investigation but the findings have not been disclosed.