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South Korea says its troops fire warning shots after North Korea soldiers come close to border

In this Saturday, July 27, 2013 photo, North Korean soldiers watch the south side with cameras at the border village of Panmunjom, which has separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea. Seoul defense officials said South Korean troops have fired warning shots after North Korean soldiers approached too close to the border separating the rival countries. (AP Photo/Lee Jin-man)

In this Saturday, July 27, 2013 photo, North Korean soldiers watch the south side with cameras at the border village of Panmunjom, which has separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea. Seoul defense officials said South Korean troops have fired warning shots after North Korean soldiers approached too close to the border separating the rival countries. (AP Photo/Lee Jin-man)  (The Associated Press)

Seoul defense officials say South Korean troops have fired warning shots after North Korean soldiers approached too close to the border separating the rival countries.

The officials say Monday's incident happened near the military demarcation line inside the 4-kilometer-wide (2.5-mile-wide) Demilitarized Zone that divides the Korean Peninsula.

They say North Korean soldiers retreated after South Korean troops fired 20 rounds of warning shots. There were no reports of casualties.

The officials spoke on condition of anonymity in line with office policy.

Tensions between the Koreas remain high after troops exchanged gunfire along the border twice last month, though there have been no reports of casualties.

The Korean Peninsula remains in a technical state of war because the Korean War in the 1950s ended with an armistice, not a peace treaty.