Joint forces in S. Korea elevate surveillance alert in response to N. Korean threat . He declined to give specific details , the news agency said . - North Korea's military says it has tested a new type of ballistic missile that can carry nuclear warheads. North Korea tested nuclear device , missiles , threatened military action .
Joint forces in S. Korea elevate surveillance alert in response to N. Korean threat . - North Korea's military says it has tested a new type of ballistic missile that can carry nuclear warheads. North Korea tested nuclear device , missiles , threatened military action .