A North Korean submarine's torpedo sank a South Korean navy ship on 26 March causing the deaths of 46 sailors, an international report has found.
Investigators said they had discovered part of the torpedo on the sea floor and it carried lettering that matched a North Korean design.
Pyongyang rejected the claim as a "fabrication" and threatened war if sanctions were imposed, say reports.
Sue Lloyd Roberts had rare access to the secretive North Korean state and found out about attitudes there to the incident, as well as what might have been behind it.
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