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In this undated image distributed on Sunday, September 3, 2017, by the North Korean government, shows North Korean leader Kim Jong Un at an undisclosed location.
In this undated image distributed on Sunday, September 3, 2017, by the North Korean government, shows North Korean leader Kim Jong Un at an undisclosed location.

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    The weapon that makes N. Korea more dangerous

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The weapon that makes N. Korea more dangerous

What is a hydrogen bomb and how much damage can it do? CNN's Paula Hancocks explains.

The weapon that makes N. Korea more dangerous

What is a hydrogen bomb and how much damage can it do? CNN's Paula Hancocks explains.