Sky NewsThe North Korean military says it has ratified a "merciless" attack against the United States, potentially involving a "cutting-edge" nuclear strike.
"The moment of explosion is approaching fast," the army said in a statement on state news agency KCNA.
War could break out "today or tomorrow," the statement said, quoting a spokesman for the General Staff of the Korean People's Army.
"The merciless operation of (our) revolutionary armed forces in this regard has been finally examined and ratified.
"The US had better ponder over the prevailing grave situation."
The North's Committee for Peaceful Reunification of Korea was later quoted by KCNA as threatening to withdraw its 53,000 workers from the joint industrial zone it shares with the South.
Pyongyang informed Seoul on Wednesday that it was stopping the daily movement of South Koreans to the Kaesong complex, the last real surviving point of contact between the two countries.
And the committee said: "If the South Korean puppets and conservative news media keep badmouthing (us), we will order all our workers to pull out from Kaesong."
North Korea's latest pronouncements came as Washington scrambled to reinforce its Pacific defences, preparing to move an advanced missile defence system to the island of Guam.
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