Following Pyongyang's claim to have successfully conducted a hydrogen bomb test on Jan. 6, Seoul last Thursday placed partial entry limits on South Korean citizens granted permission to do business within the complex.
But beginning tomorrow, only a minimum number of people directly related to operations of the industrial park will be allowed to enter. Contractors will only be allowed into the park if they enter and leave on the same day.
"We have taken these measures for the safety of our people, considering the great likelihood of heightened tensions along the border following the resumption of loudspeaker broadcasts against the North," the official said.
South Korea resumed loudspeaker broadcasts along the border Friday, following the North's fourth nuclear test.
The broadcasts, a form of psychological warfare, are feared by Pyongyang because it exposes its soldiers and residents to news and other information that is unavailable in the heavily censored state.
Meanwhile, the South Korea-U.S. forces are standing with their highest-level of combat readiness, Monday, to deter further military provocations by the North.