A South Korean soldier patrols as South Korean trucks leave the South's CIQ (Customs, Immigration and Quarantine) office to go to the inter-Korean Kaesong Industrial Complex in North Korea, just south of the demilitarised zone separating the two Koreas, in Paju, north of Seoul, April 1, 2013. North Korea said on Saturday it was entering a "state of war" with South Korea, but Seoul and the United States played down the statement as tough talk. Pyongyang also threatened to close a border industrial zone, the last remaining example of inter-Korean cooperation which gives the North access to $2 billion in trade a year. The sign reads, "Vehicle carrying passengers (top). 50m U-turn." REUTERS/Lee Jae-Won (SOUTH KOREA - Tags: MILITARY POLITICS BUSINESS) Published: Dub. 1, 2013, 3:04 dop. | Foto: Reuters