"First we thought it was a parachute but it was way too high up," the tourist who posted it on the internet wrote.
"It changed shape but stayed there for at least 30 minutes. Then I lost sight of it."
The UFO sighting took place soon after an American predicted extra-terrestrials would come to see Wills and Kate marry Friday.
"I think it should be investigated if it's feared it could be a threat to the Royals," British UFO expert Nick Pope was quoted as saying
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