The Milwaukee Police Department bombing was a November 24, 1917, bomb attack that killed ten people including nine members of local law enforcement. The perpetrators were never caught but are suspected to be an anarchist terrorist cell operating in the United States in the early 20th century. The target was initially an evangelical church in the Third Ward and only killed the police members when the bomb was taken to the police station by a concerned member of the public. The bombing remained the most fatal single event in national law enforcement history for over 80 years until the 9-11 attacks.