Could there be any better fodder for Australia's conspiracy theorists? The Department of Defence has ''lost'' its X-Files.

For decades, Defence officials dutifully investigated an unknown number of UFO sightings being reported all over the country. Intelligence officers attached to the Royal Australian Air Force checked the known movement of aircraft against reported sightings, and politely responded by mail to everyone who claimed they saw floating lights or flat saucers or streaking vapour trails. Some of the files were marked as classified.

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