The South Korean defence ministry has so far refused to comment about the allegation.
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.
It was said to be "regular deployment training" - part of a broader plan for putting in place the "extended deterrence" against the North.
"But the unthinkable thing is North Korea with a nuclear arsenal that can exceed our ability to defend ourselves or our allies".
Talwars acquitted by Allahabad High Court
The CBI court, presided by Additional Sessions Judge Shyam Lal, had, however, rejected the CBI's plea for death penalty in 2014. The verdict ends the ordeal of the parents who were found guilty by a CBI court in the sensational double murder case.
The B-1Bs also conducted exercises with Japan's Air Force in what the U.S. statement called a "sequenced bilateral mission".
Analysts believed such a test could take place on Tuesday-which could be Monday in the US due to the time difference-marking the founding of North Korea's communist Worker's Party.
"Presidents and their administrations have been talking to North Korea for 25 years, agreements made and massive amounts of money paid hasn't worked, agreements violated before the ink was dry, makings fools of USA negotiators", he said in a pair of tweets.
The exercises came as a US nuclear-powered fast-attack submarine, the USS Tuscon, made a call in South Korea's southern port of Jinhae, the US Pacific Command said.
$1.69 EPS Expected for JPMorgan Chase & Co. (JPM)
The Firm conducts its activities through a federally insured national bank subsidiary, Washington Federal, National Association. Capital International Sarl increased Coca (NYSE:KO) stake by 24,900 shares to 235,050 valued at $10.54 million in 2017Q2.
The last flight by United States bombers was 17 days earlier when four US F-35B stealth fighter jets and two B-1Bs flew over the peninsula.
President Donald Trump is "doing all the right things" in being ready to use a military option against North Korea, if that proves necessary, Rep. Adam Kinzinger said Tuesday.
Mr Trump is expected to send a "significant message" to North Korea either verbally or "kinetically" during the trip, Yonhap said, without elaborating on what that may mean.
"You see that in the actions of [North Korean leader] Kim Jong Un, reaching out to Republicans to say 'what's this guy about?' said Kinzinger".
Nanded Municipal Corporation Election Results 2017: Congress takes lead
The area is state party chief Ashok Chavan's stronghold, and over 60% turnout was observed on Wednesday. Shiv Sena is leading on one seat, and AIMIM is trailing on all seats.
The threat of an imminent missile launch came after Russian lawmakers who visited North Korea last week said they were told by officials a new test launch was being prepared.