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Itsuo Inouye/Associated Press
Women in Tokyo read copies of a Japanese newspaper reporting North Korea's nuclear test.
Jon Chol Jin/Associated Press
A North Korean state television broadcaster announced the nuclear test on a large television screen in Pyongyang.
NORTH KOREAN TVAFP/Getty Images
North Koreans in Pyongyang celebrated as they watched the announcement.
The international nuclear test monitoring agency CTBTO in Vienna, Austria, monitored the nuclear detonation.
DIETER NAGL/AFP/Getty Images
A Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) poster details previous North Korea nuclear tests.
A North Korean soldier patrolled the river bank of the North Korean town of Sinuiju, opposite the Chinese city of Dandong.
Ahn Young-joon/Associated Press
South Korean soldiers conducted an exercise near the demilitarized zone of Panmunjom in Pajuon Tuesday.
Lee Jin-man/Associated Press
A South Korean soldier watched a TV screen reporting seismic waves from North Korea's nuclear test.
The seismic magnitude of the blast was roughly twice as large as that of a 2009 nuclear test in the country, the CTBTO said.
Chung Sung-Jun/Getty Images
South Korean conservative protesters participated in a rally against North Korea's nuclear test on Tuesday.