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An official of the Earthquake and Volcano of the Korea Monitoring Division points at the epicenter of seismic waves in North Korea, in Seoul, South Korea, Friday, Sept. 9, 2016. South Korea's Yonhap news agency says Seoul believes North Korea has conducted its fifth nuclear test explosion. (AP Photo/Ahn Young-joon)
An official of the Earthquake and Volcano of the Korea Monitoring Division points at the epicenter of seismic waves in North Korea, in Seoul, South Korea, Friday, Sept. 9, 2016. South Korea's Yonhap news agency says Seoul believes North Korea has conducted its fifth nuclear test explosion. (AP Photo/Ahn Young-joon)

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    North Korea's nuclear tests: A timeline

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North Korea's nuclear tests: A timeline

Ten years, five nuclear tests, and they appear to be getting stronger. Tests over the years reflect the North's desire to increase its military capabilities.

North Korea's nuclear tests: A timeline

Ten years, five nuclear tests, and they appear to be getting stronger. Tests over the years reflect the North's desire to increase its military capabilities.