This file is from the Project Blue Book collection within the National Archives. It is a case where the witness describes an object falling like a green flame from the sky. It was shaped roughly like a cone, about 1ft high. Upon landing, it started a fire in the backyard shed of the property, and the local police were called out.
After analysis by the U.S. Air Force – they determined it was furnace slag.
The case files, along with photographs, are all below.
Project Blue Book: Hartford, Connecticut — September 4, 1960 – PHOTOGRAPHS [38 Pages, 3.51MB]