United States security officers and the United States embassy with the U.S. flag are reflected in a rain puddle in Berlin, Tuesday, April 16, 2013. On Monday April 15, 2013 two bombs exploded in the crowded streets at the Boston marathon in the United States. (AP Photo/Markus Schreiber)

Associated Press
United States security officers and the United States embassy with the U.S. flag are  reflected in a rain puddle in Berlin, Tuesday, April 16, 2013. On Monday April 15, 2013 two bombs exploded  in the crowded streets  at the Boston marathon in the United States.  (AP Photo/Markus Schreiber)
United States security officers and the United States embassy with the U.S. flag are reflected in a rain puddle in Berlin, Tuesday, April 16, 2013. On Monday April 15, 2013 two bombs exploded in the crowded streets at the Boston marathon in the United States. (AP Photo/Markus Schreiber)
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