As suspected Boston Marathon bomber Dzhokhar Tsarnaev's trial begins, take a look back at the history of terrorist attacks on home soil.
A fourth plane, United Airlines Flight 93, was targeted at the U.S. Capitol, but crashed into a field near Shanksville, Pa., after its passengers tried to overcome the hijackers. The four hijackers died in the crash along with 40 people on the plane. Here, tokens honoring Flight 93 can be seen near the fence surrounding a construction site for a permanent memorial in May 2011.
National Archives and Records Administration
Giuseppe Bellini/Getty Images
The Walt Disney Company, All Rights Reserved
iStock / crisserbug
Courtesy USA Swimming
Ethan Miller/Getty Images
American Kennel Club via CNN
Ben A. Pruchnie/Getty Images for Walt Disney Studios
Library of Congress [Public domain], via Wikimedia Commons
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