The North Korean response has been a threat of war if they are punished for the attack. BBC News:
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.
The investigation was led by experts from the US, Australia, Britain and Sweden.
It said: "The evidence points overwhelmingly to the conclusion that the torpedo was fired by a North Korean submarine.
"There is no other plausible explanation."
The report said the torpedo parts found "perfectly match" a torpedo type that the North manufactures.
Lettering found on one section matched that on a North Korean torpedo found by the South seven years ago.
