South Korea's military says the September 21 explosion in the Demilitarized Zone occurred tens of meters from an area suspected of containing mines laid by North Korean forces. The blast happened while troops were opening a search route to support a United Nations Command field inspection.
The Joint Chiefs of Staff said investigators are keeping all possibilities open, including whether an older displaced mine was involved. Evidence from the scene has been sent to the National Forensic Service to help determine whether the explosive was of North Korean or South Korean origin.
What it means
The military and United Nations Command are continuing the site investigation. The exact type and origin of the explosive remain unresolved, so the current finding narrows the location but does not yet establish who laid the device.