North Korea conducts its third nuclear test ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page 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. GEORG HOCHMUTH/EPA 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. Associated Press 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. HEINZ-PETER BADER/REUTERS 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.