At a news conference at 1 Police Plaza less than two hours after the deadly attack, John Miller, the New York Police Department’s chief of counterterrorism, cited the Islamic State’s updated guidance to jihadi aspirants contained in the third November 2016 issue of its own online journal, Rumiya (Rome), as the attacker’s probable inspiration. The article encouraged followers to attack “large outdoor conventions and celebrations, pedestrian-congested streets, outdoor markets, festivals, festivals, parades, [and] political rallies.” It even specified the ideal type, weight, and speed of a car needed for terror purposes, according to a translation provided by the Counter-Extremism Project.