What did witnesses see at Oak Ridge in 1947?

Question

What did witnesses see at Oak Ridge in 1947?

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The provided documents contain only limited direct information about Oak Ridge specifically. A memo from the FBI's Knoxville field office, addressed to the Director and titled "Flying Saucers Observed Over Oak Ridge Area," references an earlier Knoxville letter to the Director dated January 10, 1949, and forwards a letter from Colonel C. D. Gasser, USAF, AMC Engineering Field Officer at Oak Ridge, Tennessee, to G. J. Rathman of the Security Division, U.S. Atomic Energy Commission, Oak Ridge [62-HQ-83894/9b355579-a788-4ab2-aaab-14fdd258353c]. The memo states that photographs forwarded with the referenced letter were determined to be "the result of accident or purposeful hoax and are not actually photographs of a 'flying saucer.'" However, Colonel Gasser personally advised that while the photographs were not real, "his statements made concerning the existence of flying saucers and the opinions expressed by him nevertheless stand as previously stated" [62-HQ-83894/9b355579-a788-4ab2-aaab-14fdd258353c]. The documents do not provide further detail about what witnesses at Oak Ridge reported seeing in 1947 specifically. The referenced January 10, 1949 Knoxville letter is not reproduced in the provided sources.