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The mystery surrounding a giant black smoke ring over Warwick appears to have been solved.

As previously reported, the strange phenomenon was captured on film by 16-year-old Georgina Heap on Friday night.

It hung in the air for several minutes, before evaporating into nothing.

Theories have included a swarm of insects to a home-made smoke signal, but now it seems it was the result of a new pyrotechnic show being tested at nearby Warwick Castle.

A castle spokesman said: “As part of our 1,100th anniversary celebrations this year, we’ve been testing a number of fire effects to enhance our daily Trebuchet Fireball Spectacular show – the world’s largest firing catapult.

“We’ve seen a number of different effects including the vortex images that have been reported.”