USAF pilot Lieutenant Robert Arnold flying T-28 trainer aircraft at 6,000 feet 8 miles SW of Laredo, Texas, saw a bright bluish-white glowing object below him rapidly climbing to his level, showing no navigation lights. Arnold tightened his left turn to keep object in view, object suddenly climbed to 9,000 feet in several seconds then dropped down to his altitude again headed east to six miles southeast of AFB where it stopped and hovered. Arnold pursued on southeast heading but after two seconds object suddenly headed towards him on collision course at high speed, wavering slightly at about 300 feet as if determining which side to pass the aircraft then heading off Arnold's left wing at 150 feet distance, at which point he could see object as a blurred reddish-bluish haze smaller than his T-28, all of which happened too fast for evasive action. Arnold in fear turned off running lights, spiraled down to 1,500 feet while keeping object in sight as object continued to head towards him in a dive then pulled up and climbed out of sight.

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