A diamond-shaped object detected by ground surveillance radar drifting north over the Pantex Plant near Amarillo, Texas — the primary U.S. facility for nuclear weapon assembly and disassembly — on September 1, 2015. Security personnel pursued it by vehicle and tracked it by camera for several minutes at low altitude; witnesses could identify no sound or visible propulsion system and gave conflicting descriptions of its color. Footage was sent to Sandia National Labs for enhancement, and all evidence was turned over to the FBI. The object was never identified. Pursuing officers described it as roughly 4 feet tall and 2 feet wide at the base, tapering thinner toward the top, and noted it appeared to speed up and change direction while being followed. A responding Carson County Sheriff's deputy was unable to locate it after it left Pantex property.
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