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Associated Press writers Ron Todt in Philadelphia and Lara Jakes contributed to this report.
Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
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Associated Press writers Ron Todt in Philadelphia and Lara Jakes contributed to this report.
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 This material may not be published, broadcast, rewritten or redistributed.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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