UFO researchers were yesterday investigating more than 100 reported sightings of mysterious bright orange lights in the night sky.

Five 'fireballs' reportedly danced in the air for ten minutes above Bristol before suddenly vanishing from sight on Sunday.

Andrea Grayson told how people flocked into the streets to witness the "amazing display".

She said: "The first four came and seemed to wait for the last. Then they circled several times before disappearing."

Roger Rosamon, of the British UFO Research Association, refused to comment until he had fully investigated.