The Wall Street bombing occurred at 12:01 p.m. on September 16, 1920, in the Financial District of New York City. The blast killed 38 and seriously injured 143. Although the bombing was never solved, investigators and historians think it likely the Wall Street bombing was carried out by Galleanists (Italian anarchists), a group responsible for the bombings the previous year. The attack was related to postwar social unrest, labor struggles and anti-capitalist agitation in the United States.
It was more deadly than the bombing of the Los Angeles Times building in 1910 and caused the most fatalities on U.S. soil until the Bath School bombings in Michigan seven years later. It was the worst disaster in New York since the 1911 Triangle Shirtwaist Factory fire.