(REUTERS) North Korea accused the South’s navy yesterday of a grave provocation that could lead to a maritime clash after South Korean patrol boats fired warning shots to repel military vessels from the North.

South Korea’s Joint Chiefs of Staff said on Monday that three North Korean patrol boats had crossed the so-called Northern Limit Line in two separate incidents in just over an hour in the West Sea.

A communique from the North Korean navy, published by the official KCNA news agency, condemned the South and said the North’s boats were on patrol in North Korean waters.

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