US report: Origins of UFOs remain unknown
The US government says the origins of objects commonly referred to as UFOs remain unknown, but it warns that such objects could pose a national security risk.
A report compiled by the Office of the Director of National Intelligence was released on Friday.
The report states there have been 144 observations of what the government officially calls "unidentified aerial phenomena," or UAP, since 2004.
It says that except for one case attributed to a large, deflating balloon, the other sightings remain unexplained, due largely to a lack of sufficient data. It suggests a possibility that they may represent unknown technologies deployed by China or Russia.