As America marks the one-year anniversary of the Boston Marathon bombings, look back at the history of terrorist attacks on home soil.
The biggest terrorist attack on American soil took place on Sept. 11, 2001, with two hijacked airliners being flown into the World Trade Center in New York City as part of coordinated attacks on the East Coast. Both towers eventually collapsed, resulting in 2,753 deaths.
Danny Moloshok / Reuters
iStock / bowdenimages
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