The inter-Korean industrial park in the North Korean border city of Kaesong is seen in this picture taken from the South Korean observation post near the demilitarised zone separating the two Koreas in Paju in this August 11, 2010 file photo. North Korea threatened on March 30, 2013 to shut down the industrial zone it operates jointly with South Korea over perceived insults that the complex is only being kept running to raise money for the impoverished state. "If the puppet traitor group continues to mention the fact Kaesong industrial zone is being kept operating and damages our dignity, it will be mercilessly shut off and shut down," the North's KCNA news agency quoted an agency that operates the factory park just miles north of the rivals' armed border as saying. REUTERS/Jo Yong-Hak/Files (SOUTH KOREA - Tags: MILITARY POLITICS) | Foto: Reuters