South Korean army soldiers patrol along a barbed-wire fence at the Imjingak Pavilion near the border village of Panmunjom on 15 March 2013
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South Korea' will act' against provocation from North

1 April 2013 Last updated at 16:12 BST

South Korea's president has promised a strong and swift military response to any provocation from the North.

It comes after North Korea announced it was in a ''state of war'' with its southern neighbour.

Pyongyang has also threatened to close a joint industrial complex which is a crucial source of foreign currency.

Lucy Williamson reports from the crossing into the joint industrial zone.