Images from the Korean Peninsula

North Korean leader Kim Jong Un visits the Turf Institute of the Bioengineering Branch under the State Academy of Sciences in Pyongyang. (KCNA)

North Korean leader Kim Jong Un visits a construction site of the North Korean army, May 7, 2013. (KCNA)

South Korean protesters wear masks of U.S. President Barack Obama and South Korean President Park Geun-hye during a rally denouncing their policy toward North Korea near the U.S. Embassy in Seoul, May 6, 2013.

South Korean vehicles returning from North Korea's Kaesong arrive at the customs, immigration and quarantine office near the border village of Panmunjom, in Paju, South Korea, April 30, 2013.

A South Korean vehicle loaded with goods from North Korea's Kaesong arrives at the customs, immigration and quarantine office near the border village of Panmunjom, in Paju, South Korea, April 30, 2013.

A TV reporter prepares for a news report in front of an empty gate at the customs, immigration and quarantine (CIQ) office in Paju, South Korea, April 29, 2013.

An open gate at a military checkpoint of the inter-Korean transit office in the border city of Paju on April 29, 2013.

Media wait for South Koreans returning home from North Korea's Kaesong at the customs office near the border village of Panmunjom that separates the two Koreas, in Paju, South Korea, April 29, 2013.