UFO sightings can leave witnesses injured suffering radiation burns, brain problems and damaged nerves, according to newly released Pentagon files.

The report, obtained by The Sun from the Defense Intelligence Agency (DIA) as part of a huge Freedom of Information request, investigates the health impact on humans who have had paranormal experiences.

The report - titled Anomalous Acute And Subacute Field Effects on Human and Biological Tissues - investigates injuries to "human observers by anomalous advanced aerospace systems".

And the report - prepared for the DIA - warns that such objects may be a "threat to United States interests".

Humans have been found to have been injured from "exposures to anomalous vehicles, especially airborne and when in close proximity", it reads.

The report noted that often these injuries are related to electromagnetic radiation - and links them to "energy related propulsion systems".

To read more, click here.