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This undated picture released from North Korea's official Korean Central News Agency (KCNA) on August 23, 2017 shows North Korean leader Kim Jong-Un (2nd R) visiting the Chemical Material Institute of the Academy of Defense Science at an undisclosed location. / AFP PHOTO / KCNA VIA KNS / STR / South Korea OUT / REPUBLIC OF KOREA OUT   ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO/KCNA VIA KNS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS
THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP.  / STR/AFP/Getty Images
This undated picture released from North Korea's official Korean Central News Agency (KCNA) on August 23, 2017 shows North Korean leader Kim Jong-Un (2nd R) visiting the Chemical Material Institute of the Academy of Defense Science at an undisclosed location. / AFP PHOTO / KCNA VIA KNS / STR / South Korea OUT / REPUBLIC OF KOREA OUT   ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO/KCNA VIA KNS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS
THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP.  / STR/AFP/Getty Images

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S. Korea: North Korea nuke test may be coming

South Korean officials say Pyongyang may be preparing its sixth nuclear weapon test after detecting activity at a North Korean facility. CNN's Will Ripley reports.

S. Korea: North Korea nuke test may be coming

South Korean officials say Pyongyang may be preparing its sixth nuclear weapon test after detecting activity at a North Korean facility. CNN's Will Ripley reports.