Smoke rises from Yeonpyeong Island in the disputed waters of the Yellow Sea earlier today after artillery shells fired from North Korea fell on the area. STR/AFP/Getty Images hide caption

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The Two-Way

'Worst Act Of Aggression Against South Korea' Since '50s

The shells fired by the North fell on an island where civilians live -- a sharp escalation in the long-simmering tensions between the two sides.

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