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COLOR: Iridescent white, like moonglow only not as "cold"; bright enough so that no surface features could be determined, but not so bright that the shape was indistinguishable. SOUND: A loud noise, interpreted by one observer as a dull explosion and by the other as a thunderclap; the noise was heard only as the object began to rise. TACTICS: The UFO was hovering over the top of a bridge and remained in that position for approximately 30 to 45 seconds, at which time it burst into a blaze of blinding light; an explosion or thunderclap of noise was heard just before it began to rise vertically; it disappeared completely from view within five to 10 seconds. DURATION: From 30 to 55 seconds. NUMBER OF OBSERVERS: Two. TYPE OF OBSERVER: A 24-year-old supervisor for Sears, Roebuck & Co., and a 27-year-old collection manager for a finance company. NUMBER OF OBJECTS: One. OBSERVER RELIABILITY: Seemed sincere and were quite detailed in their description of the UFO; Air Force evaluation: "Excellent." SHAPE: Like a huge egg when hovering; edges diffused to disc-shape by white light when moving. DIMENSIONS: Estimated at about 100 feet long. ALTITUDE: Between 100 and 150 feet when first sighted. SPEED: Very fast when in motion. COMMENT: While the UFO was still hovering, the observers approached it in their car. At first, from