North Korea sends nuclear message, capability unclear

VIENNA (Reuters) - North Korea's third nuclear test may be aimed at showing its foes it can develop a warhead for a missile but it is still a long way from being able to threaten the United States, proliferation experts say.

The secretive Asian state is widely believed to be trying to develop a device that is compact and light enough to fit on top of a missile. North Korea said the test, which was condemned by world powers, had used a miniaturised device.