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South Korea's president has threatened  an "enormous retaliation" against North Korea if there is any further aggression against his country, just hours after scores of northern artillery shells hit Yeonpyeong, a South Korean island.

At least two soldiers were killed, 19 others injured, and many houses set ablaze on Tuesday in what appeared to be one of the most serious border incidents since the 1950-53 Korean war.

The South Korean military was placed on its highest state of alert and troops fired back with their own artillery. Both countries claimed the other had triggered the clashes.

Divya Gopalan reports on the first northern attack on South Korean soil in more than half a century.

Source: Al Jazeera