Trump administration's UFO file dump reveals black triangles flying at 1,800mph over secret US military bases

The craft were seen on at least three occasions in the past year, moving silently with no exhaust or vapour trail. Thermal scans showed an even heat signature, unlike any plane or drone engine. Officials still cannot say whether the objects came from a foreign power. Locations and dates were redacted, and only sketches over mountainous ground were released, with no photos.

A Department of War memo described one craft's surface as 'seamless' and 'featureless'.

A secret 2002 Roswell statement describes an egg-shaped craft and child-sized bodies.

Three Boy Scouts reported a silver object over Catalina Island in 1952.