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Sout Korean soldiers face the North korean side of the truce village of Panmunjom in the Demilitarized Zone (DMZ) between North and South Korea on May 14, 2014. Despite fears to the contrary, North Korea does not appear to be preparing an imminent nuclear test, a US think-tank said in an analysis of recent satellite images of Pyongyang's main test site. AFP PHOTO / Ed Jones        (Photo credit should read ED JONES/AFP/Getty Images)
Sout Korean soldiers face the North korean side of the truce village of Panmunjom in the Demilitarized Zone (DMZ) between North and South Korea on May 14, 2014. Despite fears to the contrary, North Korea does not appear to be preparing an imminent nuclear test, a US think-tank said in an analysis of recent satellite images of Pyongyang's main test site. AFP PHOTO / Ed Jones        (Photo credit should read ED JONES/AFP/Getty Images)

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    U.S. closely watching tensions between Koreas

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U.S. closely watching tensions between Koreas

CNN's Barbara Starr reports as tensions continue to rise, U.S. intelligence agencies are keeping a close eye on North Korea for any sign that the country might attack the South.

U.S. closely watching tensions between Koreas

CNN's Barbara Starr reports as tensions continue to rise, U.S. intelligence agencies are keeping a close eye on North Korea for any sign that the country might attack the South.