This file photo shows South Korea lifting the remaining half of the Cheonan from the Yellow Sea waters off Baengnyeong Island in April 2010. On March 26, 2010, the naval warship sank after a mysterious explosion that left 46 sailors dead. On July 9, 2010, investigators from South Korea, the U.S., Britain, Australia, Canada and Sweden concluded that it was struck by a torpedo of North Korean origin. (Yonhap via Associated Press)
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