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The eventual answer came in the middle of Tuesday afternoon when a statement from Warwick Castle confirmed that they had been testing fireworks.
A Warwick Castle spokesman said they had been testing "fire effects" to go with the daily firing of the Trebuchet Fireball - a giant catapult.
"We've seen a number of different effects, including the vortex images that have been reported," the spokesman said. "As yet we don't know what causes the phenomenon but it's certainly a spooky spectacle."
reply to post by conz1992
Interesting story but this is the third thread on it to my knowledge. If you want more info check them out. Most agree it was a transformer or something similar.