According to an intelligence report released on Friday, US intelligence officials revealed that 18 flying objects "UFOs", out of the dozens of mysterious flying objects reports.
The videos showed no visible thrust or appeared to use technology beyond known capabilities of the United States or its adversaries who reviewed.
Reports of "unidentified atmospheric phenomena" have not been presented as evidence of space activity on Earth, although this possibility has not been definitively ruled out.
"We have no clear indications of any extraterrestrial explanation," a US official said, adding that greater technological understanding may be required to determine the cause of many of the unexplained phenomenon.
Another official said: "Some of these may require some scientific progress on our part to allow us to better understand what we are watching." "It is clear that we need to improve our ability to analyze the remaining observations further."
The report from the Office of the Director of National Intelligence stated that in the 18 cases, US government monitors reported "unusual" movement or flight characteristics.
The report stated that the objects "appeared to be stationary in high winds, moving upwind, maneuvering abruptly, or moving at great speed, with no apparent means of thrust". Some of them released radio frequency energy that was picked up and processed by US military aircraft.
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The report was prompted in part by the public release of three Navy videos showing unidentified aerial phenomena in flight. One of the officials said the government studied these videos and the readings provided by sensors on US planes, but the government has not settled on any explanation for the phenomenon observed in the clips.
Last summer, the Pentagon revived a small secret unit called the Unidentified Atmospheric Phenomenon Task Force to study confrontations.
US military pilots have noticed objects moving at supersonic speed, more than five times the speed of sound, and performing impossible maneuvers using publicly known technology, raising fears of artificial leaps by hostile nations.
China and Russia are believed to have experimented with supersonic technology, but the report does not support a conclusion that those countries were complicit in the unexplained flights.
"We don't have any clear indications that any of these unidentified weather phenomena are part of a foreign collection program. We don't have any clear data to suggest significant technological advances by a potential opponent," said one of the officials.
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The report includes 144 reports of unknown phenomena from 2004 through this year and offers almost no conclusive explanation for the observations.
The Office of the Director of National Intelligence identified five categories for viewing unspecified aerial phenomena: airborne chaos such as birds and balloons; natural atmospheric phenomena such as thermal fluctuations; government or industrial development programmes; foreign hostile regimes; and "others" - brief encounters for which there is little information to classify more accurately.
Out of the 144 reports of witnessing unidentified atmospheric phenomena, the office placed only one case in any of the categories - a large deflated balloon. "The rest is still unexplained," the report said.
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“The potential of this report was actually significant. It could have come up with something that was indisputable evidence of extraterrestrial flight. That was the implied promise, but in the end, it goes no further than the reports from the 1950s. We can explain some of these things, but we can't explain them all," said Seth Shostak, chief astronomer at the SETI Institute.
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