After the incident, Ulster County investigators searched Bonelli's room at the home he shared with his father, and found what Ulster County District Attorney Donald Williams described as "Columbine memorabilia". Officials described the young man as being fascinated by the Columbine High School massacre. Additional searches were conducted by police after videos seized at Bonelli's residence showed him exploding homemade pipe bombs with a man named Kenneth Stine and another individual. Both individuals were later arrested and charged with violating federal explosives laws.