Wikimedia Commons: Bomb in Wall Street, 1920

“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. It was more deadly than the bombing of the Los Angeles Times building in 1910 and remained the deadliest bomb attack on U.S. soil until the Bath School bombings in Bath Township, Michigan seven years later.

At noon, a wagon passed by lunchtime crowds on Wall Street in New York City and stopped across the street from the headquarters of the J.P. Morgan bank at 23 Wall Street, on the Financial District’s busiest corner. Inside, 100 pounds (45 kg) of dynamite with 500 pounds (230 kg) of heavy, cast-iron sash weights exploded in a timer-set detonation, sending the slugs tearing through the air. The horse and wagon were blasted into small fragments. The 38 victims, most of whom died within moments of the blast, were mostly young and worked as messengers, stenographers, clerks and brokers. It caused over $2 million in property damage and wrecked most of the interior spaces of the Morgan building.” (wikipedia)