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The Latest: US assessing North Korea's likely nuclear test

Associated Press Associated Press 9/09/2016
A South Korean marine watches a TV screen reporting about North Korea's possible nuclear test at the Seoul Railway Station in Seoul, South Korea, Friday, Sep. 9, 2016. South Korea's Yonhap news agency said Seoul believes North Korea conducted its fifth nuclear test explosion on Friday. The letters on the screen read: "Explosion suspect." (Kim Ju-sung/Yonhap via AP) © The Associated Press A South Korean marine watches a TV screen reporting about North Korea's possible nuclear test at the Seoul Railway Station in Seoul, South Korea, Friday, Sep. 9, 2016. South Korea's Yonhap news agency said Seoul believes North Korea conducted its fifth nuclear test explosion on Friday. The letters on the screen read: "Explosion suspect." (Kim Ju-sung/Yonhap via AP)

SEOUL, South Korea — The Latest on North Korea's nuclear test (all times local):

12:35 p.m.

A spokesman for the U.S. National Security Council, Ned Price, says Washington is aware of seismic activity on the Korean Peninsula in the vicinity of a known North Korean nuclear test site.

He says: "We are monitoring and continuing to assess the situation in close coordination with our regional partners."

South Korea says North Korea on Friday conducted its fifth atomic test, producing its biggest-ever explosive yield, after monitors detected artificial seismic waves from a quake measuring a magnitude 5.

The U.S. Geological Survey called the seismic activity an "explosion" on its website.

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