It was unclear how long the shutdown at the industrial complex in the border city of Kaesong would last, or even how long it would take South Korean companies to close down. Pyongyang has yet to comment, but Seoul said that North Korean workers did not report to work at Kaesong on Thursday.
The shutdown is one of Seoul's strongest available punitive measures and will hurt impoverished North Korea's finances. Seoul said it wants to stop Pyongyang from using hard currency from the park to develop its nuclear and missile programs.
The South's Unification Ministry says about 130 South Koreans are planning to enter Kaesong on Thursday to begin shutdown work, and that nearly 70 South Koreans who had been staying there would be leaving.
North Korea, in a fit of anger over US-South Korean military drills, pulled its workers from Kaesong for about five months in 2013. But, generally, the complex has long been seen as above the constant squabbling and occasional bloodshed between the rival Koreas.
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The park, which started producing goods in 2004, has provided 616 billion won (USD 560 million) of cash to impoverished North Korea, Hong said.
"It appears that such funds have not been used to pave the way to peace as the international community had hoped, but rather to upgrade its nuclear weapons and long-range missiles," he said at the televised briefing.
The Unification Ministry, which is responsible for relations with North Korea, said in a statement that the government had "decided to completely shut down" the park. It notified North Korean authorities of the decision and asked them to help ensure the safe return of South Korean citizens from Kaesong.