Incident #279 Series: UAP Sightings in Utah, April 1949

This document is a comprehensive report of investigation (16D 47-2) conducted by the Office of Special Investigations (OSI) regarding a series of UAP sightings and reported explosions across northern Utah on April 5, 1949. The investigation was initiated following a request from Captain Pelham R. Burnett, District Commander of the 16th District OSI, after reports were received from various law enforcement agencies in Cache and Weber counties. Numerous civilians, including police officers, utility workers, and an associate professor of mathematics, reported seeing a 'ball of fire' or 'triangular' object descending rapidly, accompanied by loud explosions that rattled windows and left persistent smoke or vapor trails in the sky. The sightings occurred between 0945 and 1000 hours MST. Witnesses described the objects as having brilliant colors, including red, orange, and bluish-white, and noted that they appeared to descend at high speeds. Some witnesses reported hearing two distinct explosions. The investigation included interviews with multiple observers across Logan, Corinne, Portage, and Salt Lake City. Law enforcement, including the Cache County Sheriff, initially suspected a plane crash and conducted searches, but found no evidence of wreckage. The investigation concluded that the phenomena were likely caused by B-29 bombers from Castle Air Force Base, California, which were conducting practice bombing runs at the Carrington Island Bombing Range in the Great Salt Lake during the time of the reports. The report includes detailed incident summaries for each witness, weather data, and maps of the region.