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Associated Press writers Kimberly Dozier and Eileen Sullivan contributed to this report. Also contributing: Nedra Pickler, Larry Margasak, Adam Goldman, Lolita C. Baldor, Pete Yost, Donna Cassata, Henry C. Jackson and Robert Burns.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
A look at some of the worst bombings in the U.S. and infamous failed attempts.
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