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US boosts missile defence as N. Korea warns of nuclear strike

A soldier of the US Army's 23rd Chemical Battalion wears protective gear during a ceremony to recognise their official return to South Korea, at Camp Stanley in Uijeongbu, north of Seoul, on April 4, 2013. The US has scrambled to reinforce its Pacific misThe United States has scrambled to reinforce its Pacific missile defences, preparing to send ground-based interceptors to Guam, as North Korea said Thursday it had authorised plans for nuclear strikes on US targets.