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In 1974, due to a Freedom of Information Act (FOIA) request, a memorandum regarding the incident was released. Written by General George C. Marshall for President Franklin Roosevelt, and dated February 26, 1942, Marshall wrote that the "Air Raid" incident was due to "unidentified airplanes, other than American Army or Navy planes [which] were probably sighted over Los Angeles [and moved from] 'very slow' to as much as 200 mph and from elevations of 9000 to 18,000 feet." Because the objects did not seem to be part of any attack, Marshall speculated that the craft might have been commercial airplanes used as a sort of psychological warfare campaign to generate panic. This very likely was the Chief of Staff report cited by Secretary of War Stimson in his press statement the same day.