Sweden

On 4 November 1948, USAFE transmitted intelligence cable TT #1524 to General Cabell and the USAF Directorate of Intelligence. Three crews of the 307th Bomb Group had sighted an aircraft on 5 September 1948 off the west coast of Holland at 30,000 feet, assessed as a single jet-propelled aircraft employing probable rocket assists, rated B-2. The cable also reported a flying saucer hovering over Neubiberg Air Base for about thirty minutes, and relayed the Swedish Air Intelligence Service's conclusion that such phenomena "cannot be credited to any presently known culture on earth."