US Forces Korea said one of the two B-1B bombers landed at Osan Air Base, 120 kilometers from the border with North Korea, but did not say when it will return to Andersen Air Force Base in Guam.
Such flyovers are common when animosity rises on the Korean Peninsula, which is technically in a state of war because the 1950-53 Korean War ended with an armistice, not a peace treaty. The United States also flew two B-1B bombers over South Korea on September 13.
North Korea uses such flyovers and the American military presence in the South in its propaganda as alleged proof of US hostility, which it says is the reason it needs a nuclear weapons program.
After last week's flyover, North Korea's official Korean Central News Agency described the B-1B as an "ill-famed nuclear war means" and accused the United States of resorting to "nuclear threat and blackmail" against the North.
Military experts raise concerns that North Korea is moving closer toward obtaining the ability to put nuclear warheads on a variety of its ballistic missiles, a growing arsenal that one day may include a reliable weapon that could reach the US mainland.
North Korea conducted its fifth and most powerful nuclear test to date on September 9, claiming it as a successful nuclear warhead detonation that proved its ability to mass produce "standardised" nuclear weapons that could be used on missiles.
The North's state media yesterday said leader Kim Jong Un observed a ground test of a new rocket engine and ordered a satellite launch preparation.
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