North Korea claims hydrogen bomb test was 'perfect success'
The test a 'meaningful' step in completing the country's nuclear weapons programme
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In this undated image distributed on Sunday, Sept. 3, 2017, by the North Korean government, shows North Korean leader Kim Jong Un at an undisclosed location. Photo: AP/PTI
North Korea said on Sunday it has successfully tested a hydrogen bomb designed to be mounted on its newly developed intercontinental ballistic missile, producing a greater yield than any of its previous nuclear tests.