German and United States security officers patrol in front of the U.S. embassy in Berlin, Tuesday, April 16, 2013. On Monday April 15, 2013 two bombs exploded in the crowded streets near the finish line of the Boston marathon. (AP Photo/Markus Schreiber)

Associated Press
German and United States security officers patrol in front of the  U.S. embassy  in Berlin, Tuesday, April 16, 2013. On Monday April 15, 2013 two bombs exploded  in the crowded streets near the finish line of the Boston marathon.  (AP Photo/Markus Schreiber)
German and United States security officers patrol in front of the U.S. embassy in Berlin, Tuesday, April 16, 2013. On Monday April 15, 2013 two bombs exploded in the crowded streets near the finish line of the Boston marathon. (AP Photo/Markus Schreiber)
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