(Saturday, November 24, 1917, 7:33 p.m. local time) — Nine members of the Milwaukee police department and one civilian were killed and several injured tonight when a bomb, designed to destroy the Italian Evangelical Church, in the heart of the third ward, an Italian settlement, exploded in Central Police Station, where it had been carried for examination.

The perpetrators were never caught but are suspected to be an anarchist terrorist cell operating in the United States.

The bombing remained the most fatal single event in national law enforcement history for over 80 years until the September 11 attacks.