S. Korean trucks turn back as N. Korea blocks access to Kaesong South Korean trucks turn back after they were banned from having access to Kaesong joint industrial park in North Korea, at a military check point of the inter-Korean transit office in Paju on Thursday. North Korea has threatened to pull its 53,000 workers from the Kaesong joint industrial zone with South Korea and close the complex, a day after it blocked access for South Korean personnel. Images.