"North Korea has said it has abrogated an armistice that ended the 1950-53 Korean War and threatened a nuclear attack on the United States..."

SEOUL * Tue Mar 26, 2013 4:35am EDT  | (Reuters) - North Korea said on Tuesday its strategic rocket and long-range artillery units have been ordered to be combat ready, targeting U.S. military bases on Guam, Hawaii and mainland America after U.S. bombers flew sorties threatening the North.

http://www.reuters.com/article/2013/03/26/us-korea-north-combat-idUSBRE92P06520130326