San Francisco Chronicle, July 22, 1916

The route of the Preparedness Day parade, held in anticipation of the United States entry into WWI. A suitcase bomb, placed along the route, killed 10 and injured an additional 40 persons. The bomb was believed to be placed by two labor bosses, who were sentenced to death, later commuted to life in prison and finally pardoned, when later investigation showed much of the testimony during the trial to be falsified.