A wide-ranging Pentagon review of decades of U.S. government investigations into UFO sightings has found no evidence that any of the sightings were extraterrestrial in origin and also found no evidence that the U.S. government or private companies have ever possessed extraterrestrial technology that has been secretly reverse-engineered.

The review of U.S. government records dating back to 1945 was conducted by the Pentagon's All-Domain Anomaly Resolution Office (AARO) which over the past two years has integrated the U.S. government's investigations into UFO or Unidentified Anomalous Phenomena (UAP) incidents, as required by Congress because of renewed interest as to whether they are extraterrestrial in origin.

"AARO has found no verifiable evidence that any UAP sighting has represented extraterrestrial activity," Tim Phillips, AARO's acting director, told reporters ahead of the 63-page unclassified report's public release on Friday.

"AARO has found no verifiable evidence that the U.S. government or private industry has ever had access to extraterrestrial technology,' he added. "AARO.has found no indications that any information was illegally or inappropriately withheld from Congress."