South Korea's former foreign minister says his nation is on alert after the North said the two countries have entered a "state of war."
Han Sung Joo described Pyongyang's declaration as 'more than rhetoric'.
An armistice between the two has been in place since 1953, following the Korean War, but no official peace deal has ever been signed.
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Despite the possibility of conflict, people in the South Korean capital Seoul says that they are trying to act normally as they are accustomed to threats from the North:
