A British police officer claims he saw three UFOs in a crop circle.

The unnamed officer was off-duty when he says he saw three figures studying the newly-marked field in Silbury Hill.

Crop circle researcher Andrew Russell said: "He shouted to the figures who, at first, ignored him, not glancing at him. When he tried to enter the field they looked up and began running. He said, 'They ran faster than any man I have ever seen. I'm no slouch but they were moving so fast. I looked away for a second and when I looked back they were gone. I then got scared. The noise was still around but I got an uneasy feeling and headed for the car. For the rest of the day I had a pounding headache I couldn't shift.' "

Wiltshire Police refused to comment on the incident and say it is a "personal matter" for the officer involved.