North Korean subs sought
North Korean subs sought
Updated at 6:09 am today
South Korea is reportedly searching for four North Korean submarines that disappeared after leaving their bases.
A military source quoted in a South Korean newspaper says up to four North Korean submarines slipped out of port in recent days and have so far avoided detection.
Seoul is now on alert for a possible strike against a naval ship.
The South accuses the North of using a midget submarine to sink one of its ships two years ago, which left 46 sailors dead.
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