One of Britain's greatest UFO riddles refuses to go away as a new witness emerged today - 34 years after the alleged 'close encounter'. The Government is said to have covered up 1974's event in North Wales, where scores of residents reported a massive tremor, strange lights in the sky and secret-service-style 'men in black' scouring the area. It has been dubbed the 'Welsh Roswell' after the famous U.S. case in which aliens were allegedly found by authorities in New Mexico. UFO believers claimed aliens crash-landed in the Berwyn mountain range and their bodies were transported by the MoD to top-secret Wiltshire research base Porton Down. [ Visit Website ]