Los Angeles, California UFO Sighting (December 6, 1948) — FBI Files
FBI records detail a 1948 investigation in Los Angeles involving photographic evidence of an unidentified flying object and a damaged perimeter fence.
Background
On December 6, 1948, in Los Angeles, California, U.S. government investigators recorded an unidentified-object incident that remained classified for decades. The documentation regarding this event was later released to the public on May 8, 2026, as part of the Presidential Unsealing and Reporting System for UAP Encounters (PURSUE). This sighting occurred during a period of heightened public and governmental anxiety regarding aerial phenomena. The incident is categorized as part of the first wave of “flying saucer” reports that swept the United States following the Kenneth Arnold sighting of June 1947 and the Roswell incident of July 1947.
During the late 1940s, the sudden increase in aerial sightings led to a systematic approach to data collection by various federal agencies. The case in Los Angeles was filed with the Federal Bureau of Investigation, which utilized a structured reporting network to manage such anomalies. The Bureau’s Knoxville, Albuquerque, Los Angeles, and other field offices were tasked with routing UFO reports to headquarters under the Bureau’s standing protocols for the protection of vital installations. This administrative framework ensured that any potential threat to national security or sensitive infrastructure was documented and centralized for analysis by federal authorities.
What the document records
The released FBI documentation details the actions of a group of men who were dining in Los Angeles when they moved to investigate a reported flying disc. Upon arriving at the site, the group attempted to capture visual evidence of the phenomenon. They utilized both 16mm film and a Speed Graphic camera to photograph the object, though the official records indicate that the quality of some of these photographs was questionable. The presence of high-end photographic equipment like the Speed Graphic suggests a concerted effort to produce high-fidelity documentation of the sighting.
In addition to the photographic attempts, the document records physical disturbances at the site of the sighting. The witnesses were involved in repairing a fence that had been damaged by individuals attempting to reach the location of the object. While the document confirms the presence of these individuals and their activities, the specific number of witnesses is not specified in the released text. The physical damage to the perimeter suggests that the sighting drew immediate and significant public interest, leading to unauthorized attempts to access the area.
Type of case
The case is classified as including photographic or video evidence of the unidentified object. The reliance on film and still photography as primary evidence is characteristic of the era’s investigative methods, where visual documentation served as the primary means of verifying the existence of anomalous aerial phenomena.
Status
All records released under the PURSUE program are designated unresolved by the All-domain Anomaly Resolution Office (AARO) by default. The federal government has not concluded that the events were anomalous, has not concluded that they were conventional, and has not ruled out either possibility. The ambiguity of the status reflects the difficulty of verifying mid-century sightings with modern forensic standards.
Conventional candidates for sightings of this period include experimental aircraft, weather balloons, especially the Project Mogul series in the late 1940s, and atmospheric optical phenomena such as sundogs and lenticular clouds. Other possibilities considered by investigators include astronomical objects, including Venus, the Moon, and meteors near the horizon. The lack of a definitive conclusion in the FBI files leaves the Los Angeles incident of 1948 as an open entry in the history of unidentified aerial phenomena.