Mt. Rainier UFO Sighting (August 2, 1947) — FBI Files
An anonymous report to the FBI in 1947 alleged the downing of a B-25 and a Marine plane by a 20mm cannon near Mt. Rainier.
Historical Context
The summer of 1947 represents a pivotal era in the history of unidentified aerial phenomena, often referred to as the first wave of “flying saucer” reports. This period was characterized by a sudden surge in public and governmental attention toward objects in the sky, following high-profile events such as the Kenneth Arnold sighting in June 1947 and the Roswell incident in July 1947. During this time, the United States was navigating the early complexities of the Cold War, leading to heightened sensitivity regarding airspace security and the potential for advanced foreign technology to breach domestic borders.
The geography of the Pacific Northwest, particularly the area surrounding Mt. Rainier, provided a dramatic backdrop for such reports. The volcanic peaks and dense cloud cover of the Cascade Range often create complex atmospheric conditions, including lenticular clouds and optical illusions, which historically contributed to sightings of unidentified objects. In the late 1940s, the presence of military installations and the increasing frequency of aerial reconnaissance missions meant that any anomalous activity in the skies above Washington State was subject to rigorous scrutiny by federal authorities.
The August 2, 1947 Incident
On August 2, 1947, an incident occurred near Mt. Rainier that prompted a formal record within the files of the Federal Bureau of Investigation. This specific case was later released to the public on May 8, 2026, as part of the Presidential Unsealing and Reporting System for UAP Encounters (PURSUE). The documentation reveals that the report originated from an anonymous caller who provided highly specific, albeit unverified, details regarding aerial combat and downed aircraft.
According to the records, the caller claimed that a B-25 bomber had been shot down from the air using a 20mm cannon. The report further alleged that a Marine plane, which was subsequently found on Mt. Rainier, had also been shot down. The caller also indicated that a Captain Smith would be transported to Wright Field, a significant United States Air Force installation known for its role in aeronautical research and testing. While the document contains these startling claims of kinetic engagement by an unidentified force, the number of witnesses to these events is not specified within the released text.
Investigative Framework and Classification
At the time of the report, the Federal Bureau of Investigation maintained a structured protocol for handling such information. Field offices in locations such as Knoxville, Albuquerque, and Los 려서 Angeles were tasked with routing UFO reports to FBI headquarters, particularly when the reports suggested a threat to the protection of vital installations or national security. This administrative process ensured that anomalous sightings were integrated into the broader intelligence-gathering efforts of the era.
The case is classified as a visual sighting reported by ground or air observers. Because the information was provided via an anonymous telephone call, the primary evidence remains the written transcript of the report itself. The verbatim text from the file states that “the B-25 was shot. down from otha air with a 20 msm. cannon.”
Current Status and Analysis
Under the current regulatory framework of the All-domain Anomaly Resolution Office (AARO), all records released through the PURSUE program are designated as unresolved by default. The federal government has maintained a position of neutrality regarding the Mt. Rainier incident, neither concluding that the events were anomalous nor confirming that they were the result of conventional phenomena. The possibility of either explanation remains open.
In the broader context of 1947 aerial sightings, investigators often consider conventional candidates to explain such reports. These include the presence of experimental aircraft, the deployment of weather balloons—specifically the Project Mogul series active during the late 1940s—or atmospheric optical phenomena like sundogs and lenticular clouds. Additionally, astronomical objects such as Venus, the Moon, or meteors appearing near the horizon are frequently evaluated as potential sources for unidentified lights. The Mt. Rainier file remains a significant piece of the 1947 archival record, representing the intersection of public alarm and federal intelligence monitoring.