North Korea says the United States has conducted some 200 spy flights over the country this month.
The official Korean Central News Agency said Tuesday the alleged spying shows the U.S. is scared by Pyongyang's recent nuclear test. KCNA said the U.S. has conducted 20 more spy flights this month than in October last year.
North Korea shocked the world October 9 by detonating an underground nuclear device. The country said it had to test the weapon to strengthen its defenses against what it considers U.S. aggression.
KCNA quotes a military official as saying the spy flights further underscore the need for North Korea to bolster its war deterrent.
The U.S. has not yet commented on the report.
Washington has repeatedly said it has no intention of attacking North Korea and is urging a resumption of stalled multilateral talks aimed at disarming Pyongyang's nuclear program.
Some information for this report was provided by AFP and AP.