Damon M. Joseph came to the FBI's attention after he distributed ISIS propaganda on social media. Joseph communicated online with two FBI undercover agents he believed were ISIS supporters. Following the mass shooting at a synagogue in Pittsburgh, Joseph allegedly told the undercover agents: "I can see myself carrying out this type of operation." An undercover agent told Joseph he could obtain assault rifles for the attack. Joseph was arrested after he took possession of the rifles, which the FBI had rendered inoperable.