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TIME/PLACE OF SIGHTING: September 1, 1958 at 10:15 P.M. Greenwich Mean Time/Wheelus Air Force Base, Tripoli, Lybia, North Africa. TYPE OF OBSERVER: Special Investigator (8th District, Office of Strategic Investigations) and a Technical Representative of the Philco Corp. OBSERVER RELIABILITY: Regarding the Special Investigator, the Air Force Intelligence investigating officer stated that: "Observer is a highly trained, experienced OSI Investigator. Reliability: Completely reliable."; regarding the Philco Tech-Rep: "Observer seemed to be sober and intelligent with considerable knowledge of aircraft and air activities." hovering. TACTICS: The UFO first was sighted at a high altitude then descended to 2000 or 3000 feet as it passed by the observers and then climbed again to a high altitude moving from the northwest to the southeast at varying speeds (see SPEED) and faded from view. COMMENT: There were no known aircraft in the area at the time of the sighting, but there was a significant temperature-inversion from the surface (24° Centigrade) to 1000 feet (35.6° Centigrade). One observer, the Philco Tech-Rep, and his wife sighted the same UFO phenomenon two weeks earlier. At that time, there were no known aircraft - helicopters or other kinds - no weather balloons or ceilometers in the area. This observer denied that the UFO could have been any aircraft known to him because its speed varied so greatly, it had no navigational lights and it was soundless. DURATION: Two sightings in, the same area were two minutes and 90 seconds respectively. NUMBER OF OBSERVERS: Two. NUMBER OF OBJECTS: One. SHAPE: Round bluish-white object. DIMENSIONS: First observed as the size of a large star, then object grew to the size of a baseball and finally diminished to its original size and disappeared. COLOR: (See SHAPE). SOUND: None. ALTITUDE: High, somewhere near 14,000 feet; descended to 2000 or 3000 feet. SPEED: Varied from very fast to very slow, at which time the object appeared to be motionless,