A South Korean vehicle fully loaded with goods and products brought back from the Kaesong industrial complex arrives at the customs, immigration and quarantine office in Paju, north of Seoul, South Korea, Tuesday, April 30, 2013. The Democratic People's Republic of Korea (DPRK) on Monday allowed all but seven South Koreans to return home from the Kaesong joint industrial park. The 43 South Koreans had entered the South Korean territory by bus on early morning of April 30. (Xinhua/Yao Qilin)

The Grand Unification Bridge, leading to the Kaesong Industrial Complex inside the Democratic People's Republic of Korea (DPRK), is seen in Paju, north of Seoul, South Korea, April 29, 2013. The Democratic People's Republic of Korea (DPRK) on Monday allowed all but seven South Koreans to return home from the Kaesong joint industrial park. The 43 South Koreans had entered the South Korean territory by bus on early morning of April 30. (Xinhua/Yao Qilin)

South Korean vehicles carrying South Koreans and fully loaded with goods and products brought back from the Kaesong industrial complex arrive at the customs, immigration and quarantine office in Paju, north of Seoul, South Korea, Tuesday, April 30, 2013. The Democratic People's Republic of Korea (DPRK) on Monday allowed all but seven South Koreans to return home from the Kaesong joint industrial park. The 43 South Koreans had entered the South Korean territory by bus on early morning of April 30. (Xinhua/Yao Qilin)

South Korean vehicles carrying South Koreans and fully loaded with goods and products brought back from the Kaesong industrial complex arrive at the customs, immigration and quarantine office in Paju, north of Seoul, South Korea, Tuesday, April 30, 2013. The Democratic People's Republic of Korea (DPRK) on Monday allowed all but seven South Koreans to return home from the Kaesong joint industrial park. The 43 South Koreans had entered the South Korean territory by bus on early morning of April 30. (Xinhua/Yao Qilin)

South Korean soldiers patrol on Grand Unification Bridge, leading to the Kaesong Industrial Complex inside the Democratic People's Republic of Korea (DPRK), in Paju, north of Seoul, South Korea, April 29, 2013. The Democratic People's Republic of Korea (DPRK) on Monday allowed all but seven South Koreans to return home from the Kaesong joint industrial park. The 43 South Koreans had entered the South Korean territory by bus on early morning of April 30. (Xinhua/Yao Qilin)

South Korean vehicles carrying South Koreans and fully loaded with goods and products brought back from the Kaesong industrial complex arrive at the customs, immigration and quarantine office in Paju, north of Seoul, South Korea, Tuesday, April 30, 2013. The Democratic People's Republic of Korea (DPRK) on Monday allowed all but seven South Koreans to return home from the Kaesong joint industrial park. The 43 South Koreans had entered the South Korean territory by bus on early morning of April 30. (Xinhua/Yao Qilin)

A media reporter waits at the customs, immigration and quarantine (CIQ) office in Paju, north of Seoul, South Korea, April 29, 2013. The Democratic People's Republic of Korea (DPRK) on Monday allowed all but seven South Koreans to return home from the Kaesong joint industrial park. The 43 South Koreans had entered the South Korean territory by bus on early morning of April 30. (Xinhua/Yao Qilin)

Media reporters wait at the customs, immigration and quarantine (CIQ) office in Paju, north of Seoul, South Korea, April 29, 2013. The Democratic People's Republic of Korea (DPRK) on Monday allowed all but seven South Koreans to return home from the Kaesong joint industrial park. The 43 South Koreans had entered the South Korean territory by bus on early morning of April 30. (Xinhua/Yao Qilin)

South Korean vehicles carrying South Koreans and fully loaded with goods and products brought back from the Kaesong industrial complex arrive at the customs, immigration and quarantine office in Paju, north of Seoul, South Korea, Tuesday, April 30, 2013. The Democratic People's Republic of Korea (DPRK) on Monday allowed all but seven South Koreans to return home from the Kaesong joint industrial park. The 43 South Koreans had entered the South Korean territory by bus on early morning of April 30. (Xinhua/Yao Qilin)