As America marks the one-year anniversary of the Boston Marathon bombings, look back at the history of terrorist attacks on home soil.
A TNT bomb planted in an unattended horse-drawn wagon exploded on Wall Street in New York City on Sept. 16, 1920, killing 38 people and injuring hundreds more. Bolshevist or anarchist terrorists were believed to be responsible for the attack, but the crime was never solved. The attack was the deadliest act of terrorism on U.S. soil up to that point.
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