Fukuoka Japan reported disc saucer observation — April 9, 1953

It was sighted at an altitude of approximately 10,000 feet in a clear sky, and was observed to make a sudden and drastic change in course and speed as it headed in a southerly direction at high speed after being under observation for about 30 seconds. No unusual sounds were heard and no trail was observed. The object sighted here does not fit the characteristics of any known aircraft, balloon, or other conventional aerial object. Supporting case details: Reported craft or object: Disc / Saucer