North Korea sends message with nuclear test - monitor

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

The Comprehensive Nuclear Test Ban Treaty Organisation (CTBTO), an international monitoring agency, said an explosion-like event that North Korea described as a nuclear test had a magnitude of 4.9. This was bigger than similar tests it carried out in 2006 and 2009.