U.S. President Barack Obama joins other public officials and religious leaders gathered in Boston for an interfaith memorial service for the victims of the Boston Marathon bombings earlier this week. The service, called the "Healing of our City," was held at Boston's Cathedral of the Holy Cross.
Boston Honors Bombing Victims
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Local residents attend a candlelight vigil in the Dorchester neighborhood of Boston, Massachusetts, April 16, 2013, where eight-year-old victim Martin Richard lived.
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Investigators comb through the post finish line area of the Boston Marathon at Boylston Street, two days after two bombs exploded just before the finish line, April 17, 2013, in Boston.
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A worker returns a bag containing a runner's personal effects near the finish line of the Boston Marathon, after explosions killed three and injured more than 140 in Boston, April 16, 2013.