A top secret US military aircraft has been spotted in the skies above Seattle, according to bizarre claims online.
A video, posted by an account called 'Ufo disclosure' on September 18, shows a triangular UFO speeding across the sky, not far from another aircraft.
The clip, which is captioned 'Triangle UFO or TR-3B filmed in Seattle', shows what some claim is a US Air Force spy plane.
TR-3 planes do not officially exist, but according to conspiracy theorists, they are a class of US surveillance aircraft, developed in complete secret.
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