Tourists take pictures near a German police car guarding in front of the United States embassy 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
Tourists take pictures near a German police car guarding in front of the United States embassy  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)
Tourists take pictures near a German police car guarding in front of the United States embassy 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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