The Sun just released an article on around 1500 documents that were released to them in a FOIA request.

https://www.the-sun.com/news/5057218/ufos-sexual-encounters-witnesses-woman-pregnant-pentagon/
>The report - titled Anomalous Acute And Subacute Field Effects on Human and Biological Tissues - investigates injuries to "human observers by anomalous advanced aerospace systems".
>The document features a "useful database" which listed the biological effects of UFO sightings on humans and their frequency, compiled US-based civilian research agency MUFON.
>This includes bizarre occurrences such as "apparent abduction", "unaccounted for pregnancy", sexual encounters, experience of telepathy and perceived teleportation.
>The report - prepared for the DIA - goes on to say UFO sightings can leave witnesses injured suffering radiation burns, brain problems and damaged nerves.
>It warns that such objects may be a "threat to United States interests".
>The report noted that often these injuries are related to electromagnetic radiation - and links them to "energy related propulsion systems".
>It lists injuries such as heating and burn injuries from radiation, damage to brain, and the able to impact people's nerves.
>The report added said it had 42 cases from medical files and 300 similar "unpublished" cases where humans had been injured after "anomalous" encounters.
>The study argued it was possible to use this medical information to "reverse engineer" UFOs "from unknown provenance that may be a threat to United States interest".
>Another fascinating document, included in the files, sets out how to categorize "anomalous behavior" - with encounters with "ghosts, yetis, spirits, elves and other mythical/ legendary entities" classed as "AN3" and "witness interaction with AN3 entities" such as near-death experiences and religious miracles classed as AN4.

The US government was secretly investigating reports of abductions and took it seriously enough to make reports on the subject.