Japanese Police officers stand guard in front of the General Association of Korean Residents a day after North Korea's nuclear test, in Tokyo, February 13, 2013. North Korea said it successfully detonated a miniaturized nuclear device at a northeastern test site Tuesday, defying U.N. Security Council orders to shut down atomic activity or face more sanctions and international isolation. AP

South Korean army soldiers walk on a snow covered road during an exercise near the border village of Panmunjom, which has separated the two Koreas since the Korean War, in Paju, north of Seoul, South Korea. AP

South Korean residents in Japan hold a banner and raise clinched fists as they stage a protest rally against North Korea's nuclear test outside the General Association of Korean Residents in Tokyo. AP

South Korean army soldiers patrol along barbed-wire fences at the Imjingak Pavilion, near the demilitarized zone of Panmunjom, in Paju. AP

North Korean soldiers stand guard on the river bank of the North Korean town of Sinuiju, opposite the Chinese border city of Dandong. AP

A South Korean protester shouts slogans near an effigy of North Korean leader Kim Jong Un during an anti-North Korea rally to denounce North Korea's nuclear test in Seoul. AP

A South Korean protester tears a North Korean flag with a knife during a rally denouncing North Korea's nuclear test in Seoul. AP

Women read copies of a delivered extra edition of a Japanese newspaper reporting North Korea's nuclear test, in Tokyo. AP

South Korean protesters shout slogans during an anti-North Korea rally following a report of the nuclear test conducted by North Korea, in Seoul. AP

On a large television screen in front of Pyongyang's railway station, a North Korean state television broadcaster announces the news that North Korea conducted a nuclear test. AP