On the 26^th August 2023, a new far-right terrorist attack occurred in the United States. The attacker, Ryan Palmeter drove to a supermarket in a predominantly African-American neighbourhood and then opened fire with a PSA-15 semi-automatic rifle and a Glock G20. He then committed suicide when the police arrived.  Evidence of the modus operandi adopted emerged from the information gathered in open source. We identified two types of information sources: