ແຫຼມເກົາຫຼີ ຍັງສືບຕໍ່ ມີຄວາມເຄັ່ງຕຶງ ຢ່າງສູງ

South Korean soldiers patrol along a barbed-wire fence, near the demilitarized zone that separates the two Koreas in Paju, north of Seoul, April 5, 2013.

A couple looks at a map showing the demilitarized zone that separates the two Koreas, at the Imjingak pavilion in Paju, north of Seoul, April 5, 2013.

U.S. Army Patriot missile air defence artillery batteries are seen at U.S. Osan air base in Osan, south of Seoul, April 5, 2013.

South Korean soldiers take part in military training near the demilitarized zone separating the two Koreas in Paju, north of Seoul, April 4, 2013.

U.S. soldiers wear gas masks while attending a demonstration of their equipment during a ceremony to recognize the battalion's official return to the 2nd Infantry Division based in South Korea at Camp Stanley in Uijeongbu, north of Seoul, April 4, 2013.

South Korean vehicles turn back after being refused entry to Kaesong, North Korea, April 3, 2013.

Anti-war protesters raise signs during a rally denouncing the joint military drills between the South Korea and the United States near the U.S. Embassy in Seoul, South Korea, April 3, 2013.

North Koreans attend a rally against the United States and South Korea in Nampo, North Korea, April 3, 2013.

North Korean leader Kim Jong Un presides over a plenary meeting of the Central Committee of the Workers' Party of Korea in Pyongyang March 31, 2013 in this picture released by the North's official KCNA news agency.