The four aircraft then flew across the peninsula and staged another round of a firing exercise over the Yellow Sea before the two B-IBs returned home, the South Korean Joint Chiefs of Staff (JCS) said.
An unusually aggressive approach to the North by Trump, which has included rhetoric hinting at US strikes and threatening the destruction of North Korea's leadership, has some South Koreans fearful that war is closer than at any time since the Korean War ended in 1953 in a shaky cease-fire, leaving the Korean Peninsula still technically in a state of war.
In an obvious show of force over the continued missile activities of North Korea, led by Kim Jong Un, the United States military has flown two strategic bombers over the Korean peninsula.
Despite the worldwide sanctions, North Korean leader Kim Jong-un continues to develop nuclear weapons and advance his nation's ballistic missile program.More news: The Feud Between Trump and Corker Is Puzzling to Washington Insiders
"South Korean and USA air forces showed off the allies' resolve for strong retaliation against North Korea's nuclear and missile threats", the JCS said in a statement carried by local news agency Yonhap.
Meanwhile, China - North Korea's closest ally and trading partner - expressed alarm at how far the rhetoric on both sides had gone, warning of the increased risk of a "fatal misjudgement"."The worldwide community won't accept North Korea as a nuclear power".
He revealed that around 235 gigabytes of military documents had been stolen from the Defence Integrated Data Centre, and that 80% of them have yet to be identified.
"There is an urgent need for the military to change and update parts that were stolen by North Korea", Lee said.
The North Korean party anniversary passed without any missile launches or nuclear tests, but officials are wary the North could engage in more provocations at any time, especially with China to begin its all-important Communist Party Congress on October 18.More news: USA approves $15 billion worth THAAD missiles sale to Saudi Arabia
However, Trump said he still had confidence in the secretary of state.
There is no evidence that the attacks were successful, and cybersecurity experts believe that North Korea lacks the ability to disrupt the power grid.
Commenting on the news is Chris Doman, security researcher at AlienVault, who is investigating hacking groups in North Korea.
The stolen money was likely used to help advance North Korea's development of nuclear weapons, Anthony Ruggiero, a senior fellow for Foundation for Defense of Democracies, told CNN at the time.More news: Microsoft Has Given Up On Trying to Make Windows Phones a Thing
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