Over 50 years, Skinwalker ranch has come under intense scrutiny for alleged UFO sightings, with residents reporting a spate of odd paranormal incidents.



The US Advanced Aerospace Threat Identification Program, a secret £16.5million (US$22 million) investigation to study unidentified flying objects, was first made public on 2017.



Now, documents leaked by the BAASS (Bigelow Aerospace Advanced Space Studies) revealed the programme also ran a top secret investigation at the highly controversial Skinwalker ranch.



A BAASS manager told the Daily Star Online: "The investigations by BAASS provided new lines of evidence showing that the UFO phenomenon was a lot more than nuts and bolts machines that interacted with military aircraft.

“The phenomenon also involved a whole panoply of diverse activity that included bizarre creatures, poltergeist activity, invisible entities, orbs of light, animal and human injuries and much more.”



Speaking about the undercover investigation, Jeremy Corbell of Extraordinary Beliefs, told Daily Star Online: "The Pentagon's other and larger investigation delved into mysteries far more profound – far more disturbing – than alleged alien aircrafts.



"Its focus was a living laboratory and paranormal hotspot known as Skinwalker Ranch."



George Knapp, an American investigative journalist, revealed the secret document to the New York Times last year but was disappointed and claimed they left out vital information.



UFO investigation: Pentagon held secret undercover tests at Skinwalker Ranch in Utah

Skinwalker ranch in Utah is known for its paranormal and UFO sightings over the years