We're pausing our live page coverage for now. You can continue to follow the main developments in our story here. The key points so far are as follows:
- North Korea has tested what it says is a hydrogen bomb that could be loaded on to a long-range missile
- US President Donald Trump said North Korea's "words and actions" were "very hostile and dangerous"
- South Korea, Japan, China and Russia have all voiced strong criticism of the North's sixth nuclear test
- UK Prime Minister Theresa May said the "reckless" test was an "unacceptable further threat to the international community"