North Korea torpedoed South's navy ship - report

South Korea's military believes a torpedo fired from a North Korean submarine sank its navy ship last month, based on intelligence gathered jointly with the United States, a news report said on Thursday. The Yonhap news agency report appears to be the clearest sign yet that Seoul blames Pyongyang for the sinking, thought to have killed 46 sailors in what would be one of the deadliest incidents between the rivals since the end of the 1950-53 Korean War. The military's intelligence arm sent the report of "certain" North Korean involvement to the presidential Blue House soon after the incident, Yonhap quoted a high-ranking military source as saying. The report could be an embarrassment to South Korean President Lee Myung-bak, whose government has come under criticism for its handling of the incident.