UFOs sighted over Devon and Cornwall could have been an American spy plane or a Russian rocket, files released by the National Archives suggest.
Ministry of Defence reports include details on sightings across the region of a large, low-flying object, which made a humming sound, on 31 March 1993.
Witness descriptions are similar to a secret US spy plane, the files reveal.
They also note the sightings coincide with the re-entry into the earth's atmosphere of a Russian rocket.
More than 70 people, including police and military personnel, reported witnessing the object which was seen in the skies above Devon, Cornwall, South Wales and Shropshire.
The newly-released MoD files relate to sightings in the UK reported between 1981 and 1996.