Defying UN resolutions, North Korea conducted its third nuclear test on Tuesday, prompting condemnation from the US, and a call for calm from China.
North Korea stated that this third test had "greater explosive force" that its previous two, conducted in 2006 and 2009, and that this latest device was "miniaturised" and lighter.
The US president Barack Obama condemned the act as "highly provocative", adding:
"The danger posed by North Korea's threatening activities warrants further swift and credible action by the international community. The United States will also continue to take steps necessary to defend ourselves and our allies,"
In a statement China said:
"We strongly urge North Korea to abide by its non-nuclear commitment and not to take any further actions that would worsen the situation."