South Korean people returning from the Democratic People's Republic of Korea(DPRK)'s Kaesong industrial complex arrive at the Customs, Immigration and Quarantine (CIQ) office in the border city of Paju, Gyeonggi province of South Korea, April 11, 2013. The Kaesong industrial zone may cease to exist if the South Korean authority continues its confrontation policy, said a DPRK official on Thursday. (Xinhua/Park Jin-hee)

A South Korean worker returning from the Democratic People's Republic of Korea(DPRK)'s Kaesong industrial complex unloads goods at the Customs, Immigration and Quarantine (CIQ) office in the border city of Paju, Gyeonggi province of South Korea, April 11, 2013. The Kaesong industrial zone may cease to exist if the South Korean authority continues its confrontation policy, said a DPRK official on Thursday. (Xinhua/Park Jin-hee)

A South Korean worker returning from the Democratic People's Republic of Korea(DPRK)'s Kaesong industrial complex unloads goods at the Customs, Immigration and Quarantine (CIQ) office in the border city of Paju, Gyeonggi province of South Korea, April 11, 2013. The Kaesong industrial zone may cease to exist if the South Korean authority continues its confrontation policy, said a DPRK official on Thursday. (Xinhua/Park Jin-hee)

A South Korean vehicle carrying a tank arrives at the Customs, Immigration and Quarantine (CIQ) office in the border city of Paju, Gyeonggi province of South Korea, April 11, 2013. The Kaesong industrial zone may cease to exist if the South Korean authority continues its confrontation policy, said an official of the Democratic People's Republic of Korea (DPRK) on Thursday. (Xinhua/Park Jin-hee)