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    Korean crisis: What's behind the North-South tension?

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Korean crisis: What's behind the North-South tension?

CNN's Jonathan Mann reports the exchange of fire between North and South Korea is serious, but all of the ingredients for trouble have been there for decades.

Korean crisis: What's behind the North-South tension?

CNN's Jonathan Mann reports the exchange of fire between North and South Korea is serious, but all of the ingredients for trouble have been there for decades.