More now on - IAEA says North Korea has made rapid progress on nukes

I posted some headline remarks from the International Atomic Energy Agency earlier: IAEA says North Korea has made rapid progress on weapons development (nukes)

More detail now, this via Reuters:

• "(The) yield is much bigger than the previous test, and it means North Korea made very rapid progress," International Atomic Energy Agency (IAEA) Director Yukiya Amano told reporters in Seoul.
• "Combined with other elements, this is a new threat and this is a global threat," he said after a meeting with South Korean Foreign Minister Kang Kyung-wha.

Link is here for more