https://www.britannica.com/event/Wall-Street-bombing-of-1920

On this Day September 16th, 1920

Anarchist Bomb Wall Street

On New York City's Wall Street, a horse-drawn wagon stops across from the JP Morgan Bank and its cargo of 100 pounds of dynamite explodes, throwing 500 pounds of shrapnel into the crowd, killing 38 and wounding 143. Later, Italian anarchists will become the prime suspects in the terrorist act.

About noon on September 16, as Wall Street clerks, receptionists, and brokers were heading for lunch, a horse-drawn cart exploded in front of the offices of J.P. Morgan & Co. at the corner of Wall and Broad streets in downtown New York City. Thirty people were killed instantly, more than 300 were injured, and eight later died from their injuries. The noise was heard throughout Lower Manhattan and across the East River in Brooklyn. The smoke-filled streets were covered with a layer of shattered glass, debris from the damaged buildings, and bodies. The chief clerk of J.P. Morgan, William Joyce, who had been seated near the front window, was among those killed, and Junius Morgan, a son of J.P. Morgan, Jr., was wounded. The New York Stock Exchange, across Broad Street, was closed immediately.