Some history.
http://en.wikipedia.org/wiki/Wall_Street_bombing
The Wall Street bombing was an incident that occurred at 12:01 p.m. on September 16, 1920, in the Financial District of New York City. Thirty-eight were killed and 400 persons were injured by the blast.[1] It was more deadly than the 1910 bombing of the Los Angeles Times building by the McNamara brothers and would remain the deadliest bomb attack on U.S. soil for nearly seven years, until the Bath School bombings in Bath Township, Michigan.
James and John McNamara were Irish-American Los Angeles trade unionists. They are best known for their attack on the offices of the Los Angeles Times on October 1, 1910, when a bomb started a fire which killed 21 newspaper employees and injured a hundred more.