We are wrapping up our live coverage now. Below is a summary of the main points, and you can read the full story here:
- North Korea has carried out a fifth nuclear test - thought to be its largest yet.
- South Korea said the explosion carried out at 09:00 local time (01:30) BST was recorded as a 5.3 magnitude seismic event.
- Estimates of the explosive yield of the blast have varied. South Korea's military said it was about 10 kilotonnes, enough to make it the North's "strongest nuclear test ever". Other experts say initial indications suggest 20 kilotonnes or more. By comparison, the bomb dropped by the US on Japan's Hiroshima in 1945 had a yield of about 15 kilotonnes.
- US President Barack Obama said the international community had to "ensure provocative actions from North Korea are met with serious consequences".
- South Korean President Park Geun-hye called it an act of "self-destruction" showing the "maniacal recklessness" of leader Kim Jong-un.
- Japan's Prime Minister Shinzo Abe said his country "absolutely cannot condone" any such test and would "protest adamantly" to Pyongyang.
- China and Russia also condemned the test.