April 3 - North Korea blocks South Korean workers heading to the Kaesong joing industrial park in a rare move. Paul Chapman reports.
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PLEASE NOTE: EDIT CONTAINS CONVERTED 4:3 MATERIAL
North Korea rarely turns its sights on the Kaesong joint industrial park.
On Wednesday it did just that.
South Koreans turning up at the border to go to work were blocked from crossing.
Those already on the other side of the world's most heavily militarised border were allowed to leave.
One clothing factory boss was worried about the impact.
(SOUNDBITE) (Korean) SOUTH KOREAN MANAGER OF CLOTHING FACTORY IN KAESONG INDUSTRIAL ZONE, LEE EUN-HAENG SAYING:
"It will cause a problem for inter-Korean relations, and it will also risk my business. I'm very worried as things are getting worse and will be hard to restore."
Such delays are rare at the complex.
It generates two billion dollars a year for the North and 80 million in wages that go straight to the government.
South Korea's unification minister called on Pyongyang to restore access.
(SOUNDBITE) (Korean) SOUTH KOREAN UNIFICATION MINISTRY SPOKESMAN KIM HYUNG-SEOK SAYING:
"North Korea's measure to suspend the industrial zone is an obstacle to the stable management of the zone. We urge the North to immediately normalise the access to the Kaesong Industrial zone."
In a wave of increasingly heated rhetoric North Korea said on Tuesday that it would revive a mothballed nuclear plant capable of producing weapons-grade plutonium.
It didn't repeat its threats to attack South Korea and the United States.
On the same day the U.S. said a second guided-missile destroyer was on the way to waters off the Korean peninsula.
U.S. officials said it was to help provide ballistic missile defence options but gave no further details.