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By Cassandra Vinograd

North Korea mocked a U.S. show of force as bluster, calling flights by bombers near its border reckless “bluffing.”

Two nuclear-capable American B-1B bombers flew over the Korean peninsula on Monday night, accompanied by U.S. F-16s and South Korean jets.

U.S. B-1B strategic bombers fly over South Korea Tuesday.Courtesy Photo by U.S. Forces Korea

It was a clear show of force in response to Pyongyang's controversial nuclear test last week.

"The U.S. imperialists are going reckless, taken aback by the DPRK's successful nuclear test," state-run media said Wednesday. "They are bluffing that B-1Bs are enough for fighting an all-out nuclear war."

Related: U.S. Bombers Send North Korea a Message

A statement published by the official Korean Central News Agency the accused the U.S. of citing "provocations" by North Korea as a "pretext" for seeking the "opportunity of mounting a pre-emptive nuclear attack."

It said those "extremely reckless" move are "pushing the situation on the Korean peninsula to the point of explosion hour by hour" — and that North Korea is "sharply watching."

"They had better stop their rash actions," the statement warned.