South Korean trucks return back after they were refused access
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North Korea blocks South workers from Kaesong industrial zone

3 April 2013 Last updated at 07:31 BST

North Korea is blocking the entry of South Korean workers into a joint industrial zone, in a move seen as further escalating tensions.

Workers were being allowed to leave the Kaesong complex but not cross into it from the South, Seoul's Unification Ministry confirmed.

Lucy Williamson reports.