Project Blue Book Case File
Arenda, Columbia, July 1956July 1956
Summary
In July 1956, a cemetery worker named Luna in the town of Aranda, Colombia reported finding pieces of metal after a series of loud explosions. The worker said the explosions happened around 8:30 p.m., and that a bright blue cloud filled the air so intensely that he had to shield his eyes. He collected the metal fragments and brought them to local authorities.
The U.S. Air Force learned of the incident through a Spanish-language newspaper article and a letter sent to the American Embassy in Bogota. Officials decided to investigate, hoping the fragments might turn out to be meteorite material from space, though they acknowledged the objects could be more ordinary in origin. They asked the Air Attache in Bogota to interview the observer and obtain samples of the metal pieces.
When the Air Attache's office looked into the case in September 1956, they found that the metal fragments had been handed over to the Colombian National Security Police. The investigators also learned that the Colombian Army had been conducting practice artillery firing in the Aranda and Pasto area on the day of the reported sighting. Based on this detail, the Air Attache concluded that the metal pieces were probably fragments from 40mm or 20mm tracer ammunition used during the military exercises. The office was unable to locate the original observer for an interview, and the pieces were never recovered for analysis.
The full case file is reproduced below as held by the National Archives, comprising 10 pages.
Reported location
Arenda, Columbia, July 1956
Date of incident
July 1956
State / country
? / XX
Page count
10 scanned pages
USAF evaluation
unknown
Microfilm
T1206, Roll 25