AP Pro Football Writer Barry Wilner and AP Science Writer Malcolm Ritter contributed to this report.
Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
AP Pro Football Writer Barry Wilner and AP Science Writer Malcolm Ritter contributed to this report.
Copyright 2013 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 This material may not be published, broadcast, rewritten or redistributed.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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