U.S. Troops Stand 'Poised to Respond' at North Korea Border

ABC News' Devin Dwyer reports on North Korea's threats about a nuclear attack on the U.S.
2:22 | 04/04/13

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Transcript for U.S. Troops Stand 'Poised to Respond' at North Korea Border
You're watching America this morning -- America's number 1 early morning news. Good Thursday morning North Korea is again making threats about a nuclear attack on American soil US forces here and in South Korea remain at the ready in the unlikely event that such an attack would happen but there's also new efforts to defuse the tense situation between the countries. ABC's -- wires and watching developments overnight. He joins us Washington morning -- Hey good morning John -- Diana would US military officials say that tough talk from North Korea is now the most intense they've heard in years and they're not taking any chances. The North Korean military this morning -- an attack on US would be merciless using cutting edge nuclear weapons. In the streets north Koreans say they're ready for a fight to. -- with these signs to be human bombs. Top US officials say the threat is serious North Korea has the world's fourth largest military some of the actions they've taken -- last few weeks. At present. A real and clear danger. It only takes. Being wrong wants. And I don't want to be the secretary of defense who was wrong ones. The Pentagon is surrounding the Korean Peninsula with layers of missile defense sending two guided missile destroyers and land based interceptors to Guam. Don't attack on the US mainland is considered unlikely official spear in a radical move by Kim junk food could inflict serious damage and South Korea. I think we should always be concerned when somebody's threaten our homeland and -- and our allies and in and it's causing. In stability in the region. North Korea yesterday shut down this border crossing to a joint industrial complex cutting peaceful economic ties with the self. Meanwhile Korea analysts said new satellite images show the north his resume construction on -- plutonium reactor that had been shut down. Still the top US commander in the region says he's confident the threat will subside we need -- torn down a few -- That more than 28000. US troops are stationed in South Korea this morning officials say they remain on high alert -- and John. -- and thank you laugh at Salina because of that in Washington for us.

This transcript has been automatically generated and may not be 100% accurate.

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