Marathon bombing anniversary wreath laying

Cardinal Sean O’Malley, Boston Mayor Martin J. Walsh and Massachusetts Gov. Deval Patrick, join the families of those killed in the 2013 Boston Marathon bombings for a prayer, wreath laying and moment of silence at the site of the second explosion on Boylston Street in Boston, April 15, the first anniversary of the attack. (Pilot photos/ Gregory L. Tracy)

Boston Mayor Martin J. Walsh (center) and Cardinal Seán P. O'Malley join the families of those killed in the Boston Marathon bombings in observing a moment of silence at the site of the first explosion on Boylston Street in Boston April 15, the first anniversary of the attack. (Pilot photo/ Gregory L. Tracy)

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Boston Mayor Martin J. Walsh (center) and Cardinal Seán P. O'Malley join the families of those killed in the Boston Marathon bombings in observing a moment of silence at the site of the first explosion on Boylston Street in Boston April 15, the first anniversary of the attack. (Pilot photo/ Gregory L. Tracy)