Col Anahuac, Mexico, December 1957December 1957

On the morning of December 1957 at 9:35 a.m., multiple witnesses near Col Anahuac, Mexico, saw a group of colored lights moving slowly across the sky over an airport. The objects appeared at an estimated altitude of between 50,000 and 100,000 feet. Their shape was difficult to pin down and seemed to change as they moved. The lights were bright enough to see clearly in daylight.

The group of objects stayed visible for about 20 minutes. Witnesses observed somewhere between 15 and 20 separate lights, though the exact count proved hard to determine. The objects moved slowly from west to east without any clear pattern or order to their motion. One observer described them as looking "pretty," suggesting the display caught people's attention.

A captain with the U.S. Air Force stationed in Mexico City responded to the report in mid-January 1958. The officer acknowledged receipt of the witness's letter and sketches. However, he noted that radar, flight, and military units in the area had no reports of anything unusual. Despite this, the Air Force said the report would be included in their ongoing study of unidentified flying objects.

The file lists this case as unidentified. No explanation appears in the available records, and the OCR quality of the remaining pages is too poor to read further details about any investigation or conclusion. The full case file is reproduced below as held by the National Archives in 7 pages.