Boston mourns bombing victims
A man ties a bouquet of flowers onto a tree at the edge of a barricade set up along Boylston Street a day after two explosions near the finish line of the Boston Marathon, Massachusetts April 16, 2013. [Photo/Agencies]
A woman places flowers at a makeshift memorial at a barricaded entrance to Boylston Street a day after two explosions near the finish line of the Boston Marathon, Massachusetts April 16, 2013. [Photo/Agencies]