On July 16, 1952 at 09:35 AM Coast Guard seaman Shell Alpert, took this picture of four roughly elliptical blobs of light in formation through the window of his photographic laboratory. The objects were also witnessed by Coastguardsman Thomas Flaherty. Both were assigned to the base in nearby Salem, Massachusetts. The first analysis by US Air Force's Project Blue Book concluded it was probably a double exposure hoax. A second analysis by Blue Book concluded that it was probably reflections of street lamps on a window. Finally, the case was considered unexplained by Project Blue Book.

 

Source: https://www.sciencephoto.com/media/730751/view/salem-ufo-sighting-1952