Officials eventually blamed anarchists and communists for the Wall Street bombing. "The Washington Post" called the attack an "act of war". The bombing stimulated renewed efforts by police and federal investigators to track the activities and movements of foreign radicals. Public demands to track down the perpetrators led to an expanded role for the BOI, including the bureau's General Intelligence Division headed by J. Edgar Hoover. The New York City Police Department (NYPD) also pushed to form a "special, or secret, police" to monitor "radical elements" in the city.