North Korea says new nuclear test will be part of fight against U.S.

Updated 10:57 PM EST, Thu January 24, 2013

Story highlights

U.S. secretary of defense says predicting a North Korean test is difficult

Pyongyang says it plans a new nuclear test and further long-range rocket launches

It vows an "all-out action" against the United States, which it calls its "sworn enemy"

North Korea is upset by a recent U.N. Security Council resolution, an analyst says