3 anti-gravity UFOs over Leicestershire, UK

On July 23, 2015, a woman and her husband living in the county of Leicestershire (England) have seen, during day, three "anti-gravity" triangle-shaped UFO. They haven't taken photo or video.

Witness report:

I was mowing my grass when my wife noticed three black triangle craft in the sky. There was a purple hue coming from the rear of the craft and a rotten egg smell in the air. There was a buzzing noise and when my son came out his ears popped. They just hovered and then shot off. My dog was shaking in nervous temperament during sighting.

Photo: The National Space Centre in Leicester (Ned Trifle / Wikimedia - CC BY-SA 2.0)