Black hot UFO invisible to human eye filmed by stunned police helicopter pilot over Bristol
Footage showing a heat-emitting UFO which was invisible to the human eye has been captured by a police helicopter as it was flying over Bristol.
A dark, circular shape is seen hovering in the sky as police monitors can be heard observing what they are seeing - although they have admitted they have no idea what it was.
The clip was filmed on Saturday September 17 and shared online by NPAS St Athan , the National Police Air Service based in South Wales.
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