Story highlights

US bomber flyover was a response to North Korea's nuclear test

North Korea says US using flyovers in plan to launch pre-emptive attack

CNN  — 

North Korea on Wednesday scoffed at the US Air Force’s show of force a day earlier, saying Washington was “bluffing” and “blustering” with the flyover of B-1 bombers.

“They are bluffing that B-1Bs are enough for fighting an all-out nuclear war,” said a statement from Pyongyang’s Korean Central News Agency.

Two of the powerful US bombers, joined by US and South Korean fighter jets, flew over Osan Air Base south of Seoul on Tuesday to show US anger with North Korea’s nuclear weapons test four days earlier.

People watch a news report on North Korea's first hydrogen bomb test at a railroad station in Seoul on January 6, 2016. South Korea "strongly" condemned North Korea's shock hydrogen bomb test and vowed to take "all necessary measures" to penalise its nuclear-armed neighbour.  The image shown on TV shows files images from other nuclear tests from other countries and the caption in red at the bottom of the screen reads "the Blue House will convene an emergency meeting of the NSC, the National Security Council."   AFP PHOTO / JUNG YEON-JE / AFP / JUNG YEON-JE        (Photo credit should read JUNG YEON-JE/AFP/Getty Images)
North Korea's nuclear test: What you need to know
02:45 - Source: CNN

Pyongyang claimed Friday’s test showed it had a nuclear warhead that could be mounted on ballistic missiles, a possibility that increases fears for US allies in the region and also poses a threat to US bases in South Korea, Japan and Guam.

The US commander in South Korea, Gen. Vincent K. Brooks, called the North’s nuclear test “a dangerous escalation” and “an unacceptable threat.”

A US intelligence official said North Korea is the only country in the world that threatens others with a nuclear attack, and that Pyongyang shows no signs of backing off its nuclear program.

South Korean and US marines move to a position during a re-enactment of the Incheon landing to mark the 66th anniversary of the start of Operation Chromite, the battle that turned the tide in the Korean War, in the western port city of Incheon on September 9, 2016.
Seoul prepares for military option against North Korea
02:11 - Source: CNN

North Korea countered Wednesday that it was the US that was inflaming tensions.

“The US imperialists keep letting their nuclear strategic bombers fly over South Korea in a bid to seek an opportunity of mounting a preemptive nuclear attack,” the KCNA statement said.

North Korea’s military was prepared to stop any US moves, it said, with a closing warning to Washington.

“They had better stop their rash actions,” the statement said.

CNN’s Brian Todd contributed to this report.