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A South Korean worker, left, who arrives with electronic products from North Korea's Kaesong is helped by a South Korean woman who greeted him at the customs, immigration and quarantine office near the border village of Panmunjom, that has separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Monday, April 8, 2013. A top South Korean national security official said Sunday that North Korea may be setting the stage for a missile test or another provocative act with its warning that it soon will be unable to guarantee diplomats' safety in Pyongyang but added that the North's clearest objective is to extract concessions from Washington and Seoul. (AP Photo/Lee Jin-man) ( South Korea Koreas Tension )

South Korean workers carry boxes from North Korea's Kaesong upon its arrival at the customs, immigration and quarantine office near the border village of Panmunjom, that has separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Tuesday, April 9, 2013. A few hundred South Korean managers, some wandering among quiet assembly lines, were all that remained Tuesday at the massive industrial park run by the rival Koreas after North Korea pulled its more than 50,000 workers from the complex. Others stuffed their cars full of goods before heading south across the Demilitarized Zone that divides the nations. (AP Photo/Lee Jin-man) ( South Korea Koreas Tension )

South Korean vehicles return from the North Korean city of Kaesong at the customs, immigration and quarantine office in Paju, South Korea, near the border village of Panmunjom, Thursday, April 4, 2013. North Korea on Wednesday barred South Korean workers from entering a jointly run factory park just over the heavily armed border in the North, officials in Seoul said, a day after Pyongyang announced it would restart its long-shuttered plutonium reactor and increase production of nuclear weapons material. (AP Photo/Ahn Young-joon) ( South Korea Koreas Tension )

South Korean soldiers check vehicles heading towards the South's CIQ (Customs, Immigration and Quarantine) located just south of the demilitarized zone separating the two Koreas, on the Grand Unification Bridge in Paju, north of Seoul, early April 8, 2013. North Korea said on Monday it would withdraw its workers from the Kaesong factory park jointly run with South Korea and temporarily suspend all operations there. REUTERS/Lim Byong-sik/Yonhap ( KOREA-NORTH/ )

South Korean truck drivers take a rest next to their trucks as they wait to enter the Kaesong industrial complex in North Korea at the South's Customs, Immigration and Quarantine (CIQ) area, just south of the demilitarised zone separating the two Koreas, in Paju, north of Seoul, April 4, 2013. North Korea closed access to a joint factory zone with South Korea on Wednesday, officials said, putting at risk $2 billion a year in trade that is vital for an impoverished state with a huge army, nuclear ambitions and a hungry population. REUTERS/Kim Hong-Ji ( KOREA-NORTH/ )

South Korean employees working at the Kaesong Industrial Complex (KIC) change their license plates authorized by North Korea, to South Korean ones, upon arrival at the South's Customs, Immigration and Quarantine (CIQ) area, just south of the demilitarized zone separating the two Koreas, in Paju, north of Seoul, April 4, 2013. North Korea barred entry to a joint industrial complex it shares with the South for a second day on Thursday, the South Korean Unification Ministry said, but would allow 222 South Korean workers to leave the zone through the day. REUTERS/Kim Hong-Ji ( KOREA-NORTH/KAESONG )

A South Korean truck driver returning from the Kaesong Industrial Complex (KIC) inside the North Korean border, changes his license plate authorized by North Korea to a South Korean one upon his arrival at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarized zone separating the two Koreas, in Paju, north of Seoul, April 8, 2013. Movement around an atomic test site in North Korea indicates the reclusive state may stage another nuclear test, a South Korean minister said on Monday, an act that would further drive up tensions on the Korean peninsula. REUTERS/Kim Hong-Ji ( KOREA-NORTH/ )

A South Korean truck transporting products made in KIC (Kaesong Industrial Complex) passes through a gate at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarized zone separating the two Koreas, in Paju, north of Seoul, April 8, 2013. North Korea said on Monday it would withdraw its workers from the Kaesong factory park jointly run with South Korea and temporarily suspend all operations there. The sign board reads "Inter-Korean Transit Office". REUTERS/Kim Hong-Ji ( KOREA-NORTH-KAESONG/ )

South Korean vehicles, left, return from the North Korean city of Kaesong at Unification Bridge in Paju, South Korea, near the border village of Panmunjom, Saturday, April 6, 2013. More South Koreans on Saturday began to leave North Korea and the factory park where they work, four days after Pyongyang closed the border to people and goods. The letters read " Unification Gate." (AP Photo/AhnnYoung-joon) ( South Korea Koreas Tension )

South Korean army soldiers patrol along a barbed-wire fence near a directional sign showing the distance to North Korea's Kaesong city and South Korea's capital Seoul at the Imjingak Pavilion near the border village of the Panmunjom, which separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Friday, April 5, 2013. After a series of escalating threats, North Korea has moved a missile with "considerable range" to its east coast, South Korea's defense minister said Thursday. But he emphasized that the missile was not capable of reaching the United States and that there are no signs that the North is preparing for a full-scale conflict. (AP Photo/Lee Jin-man) ( South Korea Koreas Tension )

Workers move clothes, made in North Korea's inter-Korean Kaesong Industrial Complex, from a van to another van on the Grand Unification Bridge, which leads to the demilitarized zone separating North Korea from South Korea, in Paju, north of Seoul April 6, 2013. The van (L) returned to South Korea from the inter-Korean Kaesong Industrial Complex. North Korea warns it could not guarantee the safety of diplomats after next Wednesday and has asked embassies to consider moving staff out of the country, European diplomats said, amid high tension on the Korean peninsula. REUTERS/Lee Jae-Won ( KOREA-NORTH/ )

South Korean workers deliver boxes from the Kaesong industrial complex inside North Korea, at a military checkpoint in Paju on April 9, 2013. North Korean workers boycotted work after Pyongyang suspended operations of the complex, upping the pressure on Seoul in an escalating military crisis. KIM JAE-HWAN/AFP/Getty Images ( 518757535 )

Workers move parts from their factory in North Korea's inter-Korean Kaesong Industrial Complex from a van to a truck on the Grand Unification Bridge, which leads to the demilitarized zone separating North Korea from South Korea, in Paju, north of Seoul April 6, 2013. The van returned to South Korea from the inter-Korean Kaesong Industrial Complex, carrying their products, boxes of mobile phone cases and parts of their factory in Kaesong. North Korea warns it could not guarantee the safety of diplomats after next Wednesday and has asked embassies to consider moving staff out of the country, European diplomats said, amid high tension on the Korean peninsula. REUTERS/Lee Jae-Won ( KOREA-NORTH/ )

A general view of empty road connection Kaesong Industrial Complex (KIC) with South's CIQ (Customs, Immigration, Quarantine) at inter-Korean transit office in Paju on April 4, 2013 in Paju, South Korea. 400 South Koreans remain in the joint industrial complex fearing they can not get back there once they return to South. In recent weeks North Korea has threatened to attack South Korea and U.S. military bases. (Photo by Chung Sung-Jun/Getty Images) ( 165394723 )

A South Korean man uses his mobile phone in front of empty lockers which are used for worker's belongings before leaving for the North Korean city of Kaesong, at the customs, immigration and quarantine office near the border village of Panmunjom, that has separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Monday, April 8, 2013. North Korea raised tensions Wednesday when it barred South Koreans and supply trucks from entering the Kaesong industrial complex, where South Korean companies have employed thousands of North Korean workers for the past decade. (AP Photo/Lee Jin-man) ( South Korea Koreas Tension )

A South Korean truck driver (L) returning from the Kaesong Industrial Complex (KIC) inside the North Korean border, answers reporters' questions upon his arrival at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarized zone separating the two Koreas, in Paju, north of Seoul, April 8, 2013. Movement around an atomic test site in North Korea indicates the reclusive state may stage another nuclear test, a South Korean minister said on Monday, an act that would further drive up tensions on the Korean peninsula. REUTERS/Kim Hong-Ji ( KOREA-NORTH/ )

Journalists question the driver of a South Korean vehicle carrying products made in Kaesong Industrial Complex, located north of the North Korean border, as it arrives to the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarized zone separating the two Koreas, in Paju, north of Seoul, April 9, 2013. North Korea warned foreigners in South Korea on Tuesday to quit the country because they were at risk in the event of conflict, the latest threat of war from Pyongyang. REUTERS/Lim Byong-sik/Yonhap ( KOREA-NORTH/ )

South Korean workers who work at the Kaesong Industrial Complex in North Korea, arrive from the North by a bus, which has been used as a commuting bus to Kaesong, as a van carrying products made in Kaesong is seen at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarized zone separating the two Koreas, in Paju, north of Seoul, April 9, 2013. North Korea warned foreigners in South Korea on Tuesday to quit the country because they were at risk in the event of conflict, the latest threat of war from Pyongyang. REUTERS/Kim Tae-hyong/The Hankyoreh ( KOREA-NORTH/ )

South Korean small business owners who run factories in the sprawling complex in North Korea's border city of Kaesong, hold a press conference to demand that the North Korea to normalize the border crossings in front of the gateways to North Korea at the customs, immigration and quarantine office in Paju, South Korea, near the border village of Panmunjom, Thursday, April 4, 2013. North Korea on Wednesday barred South Korean workers from entering a jointly run factory park just over the heavily armed border in the North, officials in Seoul said, a day after Pyongyang announced it would restart its long-shuttered plutonium reactor and increase production of nuclear weapons material. (AP Photo/Ahn Young-joon) ( South Korea Koreas Tension )

South Koreans wait for a chance to enter the North Korean city of Kaesong at the customs, immigration and quarantine office near the border village of Panmunjom, which has separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, Monday, April 8, 2013. North Korea raised tensions Wednesday when it barred South Koreans and supply trucks from entering the Kaesong industrial complex, where South Korean companies have employed thousands of North Korean workers for the past decade. The writing reads "Departure and Kaesong." (AP Photo/Lee Jin-man) ( South Korea Koreas Tension )

North Korean workers work at a factory of South Korean apparel maker Shinwon company in the inter-Korean industrial park in Kaesong, north of the heavily fortified Demilitarized Zone that divides the Korean peninsula in this May 26, 2005 file photo. North Korea said on April 8, 2013 it would withdraw its workers from the Kaesong factory park jointly run with South Korea and temporarily suspend all operations there. REUTERS/Lee Jae-won/Files ( KOREA-KAESONG )

In this Sept. 21, 2012 photo, a South Korean manager consults with North Korean workers preparing to produce clothing at the South Korean-run ShinWon Corp. garment factory inside the Kaesong industrial complex in Kaesong, North Korea. On Wednesday, April 3, 2013, North Korea refused entry to South Koreans trying to cross the Demilitarized Zone to get to their jobs managing factories in the North Korean city of Kaesong. Pyongyang had threatened in recent days to close the border in anger over South Korea's support of U.N. sanctions punishing North Korea for conducting a nuclear test in February. (AP Photo/Jean H. Lee) ( North Korea Koreas Tension )

In this photo taken on Sept. 21, 2012, two North Korean men working for ShinWon, a South Korean clothing maker, prepare garments for production at a factory in Kaesong, North Korea. Since April 3, North Korean authorities have barred South Koreans, including ShinWon managers, from entering North Korea through the Demilitarized Zone to get to the Kaesong industrial complex where some 120 South Korean companies run factories employing North Korean workers. (AP Photo/Jean H. Lee) ( North Korea Inside Kaesong )

In this Sept. 21, 2012 photo, a North Korean worker handles wires at a South Korean-run factory inside the Kaesong industrial complex in Kaesong, North Korea. On Wednesday, April 3, 2013, North Korea refused entry to South Koreans trying to cross the Demilitarized Zone to get to their jobs managing factories in the North Korean city of Kaesong. Pyongyang had threatened in recent days to close the border in anger over South Korea's support of U.N. sanctions punishing North Korea for conducting a nuclear test in February. (AP Photo/Jean H. Lee) ( North Korea Koreas Tension )

A South Korean truck driver leaves his truck as he waits to enter the Kaesong industrial complex in North Korea, at the South's Customs, Immigration and Quarantine (CIQ) area, just south of the demilitarized zone separating the two Koreas, in Paju, north of Seoul, April 4, 2013. North Korea closed access to a joint factory zone with South Korea on Wednesday, officials said, putting at risk $2 billion a year in trade that is vital for an impoverished state with a huge army, nuclear ambitions and a hungry population. REUTERS/Kim Hong-Ji ( KOREA-NORTH/ )

South Korean trucks turn back their way as they were refused to enter North Korea's city of Kaesong, at the customs, immigration and quarantine office in Paju, South Korea, near the border village of Panmunjom, Thursday, April 4, 2013. North Korean border authorities refused to allow entry to South Koreans who manage jointly run factories in Kaesong. (AP Photo/Ahn Young-joon) ( South Korea Koreas Tension )

Trucks returning to South Korea from North Korea drives on the Grand Unification Bridge, which leads to the demilitarized zone separating North Korea from South Korea in Paju, north of Seoul April 6, 2013. The trucks were carrying products made in North Korea's inter-Korean Kaesong Industrial Complex, and parts of a factory in Kaesong. North Korea warns it could not guarantee the safety of diplomats after next Wednesday and has asked embassies to consider moving staff out of the country, European diplomats said, amid high tension on the Korean peninsula. REUTERS/Lee Jae-Won ( KOREA-NORTH/ )

A television camera man films a truck on the Grand Unification Bridge, which leads to the demilitarized zone separating North Korea from South Korea, in Paju, north of Seoul April 6, 2013. The truck, which returned to South Korea from North Korea's inter-Korean Kaesong Industrial Complex, carried products made in Kaesong as well as parts of a factory in the industrial complex. North Korea warns it could not guarantee the safety of diplomats after next Wednesday and has asked embassies to consider moving staff out of the country, European diplomats said, amid high tension on the Korean peninsula. REUTERS/Lee Jae-Won ( KOREA-NORTH/ )

South Korean vehicles transporting both South Korean employees working at the Kaesong Industrial Complex (KIC) and products made in KIC wait to pass through the South's Customs, Immigration and Quarantine (CIQ), just south of the demilitarized zone separating the two Koreas, in Paju, north of Seoul, April 4, 2013. North Korea barred entry to a joint industrial complex it shares with the South for a second day on Thursday, Seoul's Unification Ministry said, and demanded extended notice of when hundreds of South Korean workers planned to leave. REUTERS/Kim Hong-Ji ( KOREA-NORTH/KAESONG )

The sun sets near a barbed-wire checkpoint near the border village of Panmunjom on April 4, 2013 in Paju, South Korea. Still 400 South Korean remain in the joint industrial park fearing they can not get back there once return to South. In recent weeks North Korea have threatened to attack South Korea and U.S. military bases, with South Korean and American intelligence identifying what is believed to be an intermediate-range missile being moved by North Korea to its eastern coast, in preparation for a planned strike. (Photo by Chung Sung-Jun/Getty Images) ( 165431777 )

South Korean soldiers patrol inside the barbed-wire fence near the border village of Panmunjom on April 4, 2013 in Paju, South Korea. Still 400 South Korean remain in the joint industrial park fearing they can not get back there once return to South. In recent weeks North Korea have threatened to attack South Korea and U.S. military bases, with South Korean and American intelligence identifying what is believed to be an intermediate-range missile being moved by North Korea to its eastern coast, in preparation for a planned strike. (Photo by Chung Sung-Jun/Getty Images) ( 165431776 )

A North Korean soldier keeps watch at a guard post near the inter-Korean Kaesong industrial complex in this picture taken from a South Korean military observation post near the truce village of Panmunjom in the demilitarized zone separating the two Koreas in Paju, north of Seoul April 4, 2013 in this picture provided by Yonhap. Russia said on Thursday that North Korea's disregard for U.N. restrictions was unacceptable and that its decision to pursue a nuclear program radically limited the chances of resuming stalled six-party nuclear talks. REUTERS/Lee Jung-hoon/Yonhap ( KOREA-NORTH/ )

North Korea's Kaesong joint industrial complex is seen over a North Korean guard post (bottom) as seen from a South Korean observation post in the border city of Paju on April 9, 2013. North Korean workers failed to show on April 9 at the Kaesong joint industrial zone, a day after Pyongyang said it was withdrawing labour and suspending operations at the Seoul-funded complex. WON DAE-YEON/AFP/Getty Images ( 518756619 )

A South Korean security guard directs traffic as a vehicle transporting employees working at the Kaesong Industrial Complex (KIC) inside the North Korean border, passes through a gate at the South's CIQ (Customs, Immigration and Quarantine), just south of the demilitarized zone separating the two Koreas, in Paju, north of Seoul, April 8, 2013. North Korea said on Monday it would withdraw its workers from the Kaesong factory park jointly run with South Korea and temporarily suspend all operations there. REUTERS/Kim Hong-Ji ( KOREA-NORTH-KAESONG/ )

A South Korean soldier patrols at a checkpoint on the Grand Unification Bridge, which leads to the demilitarized zone separating North Korea from South Korea, in Paju, north of Seoul April 8, 2013. The North, led by 30-year-old Kim Jong-un, has been issuing vitriolic threats of war against the United States and U.S.-backed South Korea since the United Nations imposed sanctions in response to its third nuclear weapon test in February. REUTERS/Kim Hong-Ji ( KOREA-NORTH-KAESONG )

A South Korean soldier sets up a barricade on the road connecting South and North Korea at the Unification Bridge on April 9, 2013 in Paju, South Korea. North Korea announced it will withdraw all workers from Kaesong joint industrial complex, five days after unilaterally banning South Korean workers re-entry to Kaesong. (Photo by Chung Sung-Jun/Getty Images) ( 166098071 )

A South Korean soldier sets up a barricade at a checkpoint on the Grand Unification Bridge, which leads to the demilitarized zone separating North Korea from South Korea, in Paju, north of Seoul April 8, 2013. The North, led by 30-year-old Kim Jong-un, has been issuing vitriolic threats of war against the United States and U.S.-backed South Korea since the United Nations imposed sanctions in response to its third nuclear weapon test in February. REUTERS/Kim Hong-Ji ( KOREA-NORTH/ )

A general view of empty road connection Kaesong Industrial Complex (KIC) with South's CIQ (Customs, Immigration, Quarantine) at inter-Korean transit office in Paju on April 4, 2013 in Paju, South Korea. 400 South Koreans remain in the joint industrial complex fearing they can not get back there once return to South. In recent weeks North Korea have threatened to attack South Korea and U.S. military bases. (Photo by Chung Sung-Jun/Getty Images) ( 165394728 )

The road connecting Kaesong Industrial Complex (KIC) with South's CIQ (Customs, Immigration, Quarantine) carries no traffic on April 9, 2013 in Paju, South Korea. North Korea announced it will withdraw all workers from Kaesong joint industrial complex, five days after unilaterally banning South Korean workers re-entry to Kaesong. (Photo by Chung Sung-Jun/Getty Images) ( 166121283 )

A cleaner walks on an empty road connecting the Kaesong Industrial Complex (KIC) with the South's Customs, Immigration and Quarantine (CIQ), just south of the demilitarized zone separating the two Koreas, in Paju, north of Seoul, April 4, 2013. North Korea barred entry to a joint industrial complex it shares with the South for a second day on Thursday, Seoul's Unification Ministry said, and demanded extended notice of when hundreds of South Korean workers planned to leave. REUTERS/Kim Hong-Ji ( KOREA-NORTH/KAESONG )

South Korean mans cleaning at empty road connection Kaesong Industrial Complex (KIC) with South's CIQ (Customs, Immigration, Quarantine) at inter-Korean transit office in Paju on April 4, 2013 in Paju, South Korea. 400 South Koreans remain in the joint industrial complex fearing they can not get back there once return to South. In recent weeks North Korea have threatened to attack South Korea and U.S. military bases. (Photo by Chung Sung-Jun/Getty Images) ( 165394721 )

A South Korean worker walks on an empty road connecting the Kaesong Industrial Complex (KIC) with South Korea's CIQ (Customs, Immigration and Quarantine), just south of the demilitarized zone separating the two Koreas, in Paju, north of Seoul, April 3, 2013. North Korean authorities were not allowing any South Korean workers into a joint industrial park on Wednesday, South Korea's Unification Ministry and a Reuters witness said, adding to tensions between the two countries. The Korean characters on the road read as "Kaesong". REUTERS/Kim Hong-Ji ( KOREA-NORTH/ZONE )