North Korea has a nuclear weapon, says US agency as South dismisses capabilities
First time such a conclusion by a US agency made public

A US government agency has said North Korea has a nuclear weapon it can mount on a missile, adding an ominous dimension to threats of war by Pyongyang.
But the assessment was swiftly dismissed by several US officials and South Korea.
The Defense Intelligence Agency (DIA) said it had concluded with “moderate confidence” that North Korea had developed a nuclear bomb that could be fitted on a ballistic missile, but added such a weapon would probably be unreliable.
Its assessment was made public by a US lawmaker amid soaring tension on the Korean peninsula and just hours before Secretary of State John Kerry arrives in Seoul on a visit to the region that will include stops in China and Japan.
Videographic: A guide to North Korea's nuclear programme
South Korean and US officials say Pyongyang appears set to test-launch a medium-range missile as a show of strength ahead of the anniversary on Monday of the birth of North Korean founder Kim Il-Sung. The unpredictable state has conducted three nuclear tests, but it was not believed to be near weapons capability.