The US has joined condemnation of North Korea after it tested what it says is a more advanced nuclear weapon.
Pyongyang said it had successfully trialled a hydrogen bomb that could be loaded on to a long‑range missile.
US President Donald Trump tweeted that North Korea's "words and actions" were "very hostile and dangerous".
North Korea has defied UN sanctions and international pressure to develop nuclear weapons and test missiles that could potentially reach the US.
South Korea, Japan, China and Russia have all voiced strong criticism of the North's sixth nuclear test.
Source: BBC
