Lexington Avenue explosion
The Lexington Avenue explosion was the July 4, 1914, explosion of a terrorist bomb in an apartment at 1626 Lexington Avenue in New York City. Members of the Lettish section of the Anarchist Black Cross (ABC) were constructing a bomb in a seven-story tenement when the group's large supply of dynamite exploded prematurely.
Source: Wikipedia — Lexington Avenue explosion (CC BY-SA 4.0)