US taking North Korea's threats 'seriously'

US Defence Secretary Chuck Hagel said he took North Korea's nuclear threats "seriously" as the US sent a missile defence system to Guam as a "precaution."

Hagel added that North Korea now had nuclear and missile delivery capacity and posed a "real and clear" danger to the US and its allies.

Read: Inside North Korea's secret tunnels to the South.

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S Korea on alert for missile test

South Korea and the US remain on high alert for a North Korean missile test. Pyongyang has stationed as many as five medium-range missiles on its east coast, according to defence assessments made by Washington and Seoul.