"A South Korean ship has been sunk in the vicinity of the maritime border with North Korea. While details are sketchy, initial reports suggest that some South Korean naval ships had been involved in combat with an unidentified ship in the area immediately preceding the incident. Other reports suggest that the ship was struck by a torpedo. Yet another indicates a stern explosion.
Tensions between the two Koreas have always been at least moderately high, but previous governments in the South have tended to seek a rapprochement. That warming has cooled significantly in recent months; one result has been occasional naval skirmishes."