A mystical ring which appeared in the Norfolk sky on Monday 1 March has been explained by air traffic control at Norwich Airport.
A US military pilot carrying out an air test at 35,000 feet - about six and a half miles high - flew a perfect circle above Dereham.
The weather conditions meant he left a vapour trail which could be seen from as far away as Norwich.
People from across the county have sent in their photos of loop in one of our most popular photo galleries ever. Thanks to everyone who sent in their snaps.
Young photographer Benjo moved away from the trees to get this second photo.
Brian took this snap of the ring over Daffy Green, Scarning.
David Adams captured the circle on his camera as he was leaving work at Wymondham.
You can see just how bright the circle looked with David Adams' second image.
