[link to www.telegraph.co.uk]
The sergeant, who has not been named, was off-duty when he saw the figures standing in a field near Silbury Hill, and stopped his car to investigate.

However, as he approached the 'men' – all over 6ft tall with blond hair – he heard "the sound of static electricity" and the trio ran away ''faster than any man he had ever seen''.

The officer returned to his home in Marlborough, Wiltshire, and contacted paranormal experts and told them he had spotted a UFO.

Wiltshire Police has refused to comment on the incident, saying it is a ''personal matter'' for the officer involved.