UFO enthusiasts called it the "Welsh Roswell" and insisted that one evening in 1974 an alien craft crashed in north Wales and the government secretly removed dead extraterrestrial bodies, the latest files from the National Archives reveal today.

The documents describe how residents of Llandrillo in Merionethshire, near the Berwyn mountains, first reported strange lights streaking across the sky. Then as the night wore on the villagers heard a colossal explosion and felt a tremor ripple through their homes.

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