Boston Mayor Marty Walsh, right. looks down after Boston Marathon survivor Jane Richard, left, and her brother Henry removed a drape covering a memorial honoring victims and survivors at one of two blast sites near the finish line of the Boston Marathon in Boston, Wednesday, April 15, 2015. Parents, Bill and Denise Richards, back, stood by during the unveiling. Boston marked the second anniversary of the 2013 marathon bombings with a subdued remembrance that includes a moment of silence, the pealing of church bells and a call for kindness. The children lost their brother Martin Richard while standing with him during one of the explosions. (John Tlumacki/The Boston Globe via AP)
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