___
Associated Press Writers Marcy Gordon and Pete Yost in Washington contributed to this story.
Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.
Photo Galleries
History of U.S. Bombings, Failed Attempts
A look at some of the worst bombings in the U.S. and infamous failed attempts.
advertisement
Follow U.S. News
Like Us On Facebook
Subscribe
U.S. News Weekly
An insider's guide to politics and policy, available on the iPad or as a PDF download.
Reader Comments (