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The North deploys approximately 65 percent of its military units, and up to 80 percent of its estimated aggregate firepower, within 60 miles of the demilitarized zone (DMZ), according to an estimate by the International Institute for Strategic Studies.

House Speaker-designate John A. Boehner, Ohio Republican, said in a statement that North Korea is an “unstable, aggressive regime” and he joined Mr. Obama in condemning the attack by the North.

This article is based in part on wire service reports.