Boston

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CORRECTS DATE TO TUESDAY, APRIL 15 - Heather McDade of Boston, right, wipes her eye while watching a tribute ceremony with others on an over-sized outdoor monitor, Tuesday, April 15, 2014, on Boylston Street in Boston. The ceremony was held for those killed and injured in the bombings at the finish line of the Boston Marathon a year ago. (AP Photo/Steven Senne)

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Police salute as a U.S. flag is raised at the finish line during a tribute in honor of the one year anniversary of the Boston Marathon bombings, Tuesday, April 15, 2014 in Boston. (AP Photo/Charles Krupa)

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Former Boston Mayor Tom Menino, Boston Mayor Martin Walsh, Vice President Joe Biden and Mass. Gov. Deval Patrick lower their heads for a moment of silence during a tribute in honor of the one year anniversary of the Boston Marathon bombings, Tuesday, April 15, 2014 in Boston. (AP Photo/Charles Krupa)

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The family of 2013 Boston Marathon bombing victim Martin Richard, from left, mother Denise, brother Henry, and father Bill Richard walk onto Boylston street for the raising of the flag during a tribute on the one year anniversary of the Boston Marathon bombings, Tuesday, April 15, 2014 in Boston. (AP Photo/Charles Krupa)

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2013 Boston Marathon bombing survivor Erika Brannock, a pre-school teacher from the Baltimore area, with hat, is hugged as her mother, Carol Downing, watches at right after a remembrance ceremony at the marathon finish line on Boylston Street in Boston, Tuesday, April 15, 2014. (AP Photo/Elise Amendola)

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Family members, survivors and friends of the 2013 Boston Marathon bombing react near the finish line after a remembrance ceremony on Boylston Street in Boston, Tuesday, April 15, 2014. (AP Photo/Elise Amendola)

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Marathon survivor Erika Brannock, a teacher from Maryland, uses a walker as she prepares to cross the finish line following a tribute in honor of the one year anniversary of the Boston Marathon bombings, Tuesday, April 15, 2014 in Boston. (AP Photo/Charles Krupa)

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Survivors, officials, first responders and guests pause as the flag is raised at the finish line during a tribute in honor of the one year anniversary of the Boston Marathon bombings, Tuesday, April 15, 2014 in Boston. (AP Photo/Charles Krupa)

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Survivors, officials, first responders and guests pause as the flag is raised at the finish line during a tribute in honor of the one year anniversary of the Boston Marathon bombings, Tuesday, April 15, 2014 in Boston. (AP Photo/Charles Krupa)

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** FILE ** Former Boston Mayor Thomas Menino, left, Boston Mayor Marty Walsh, center, and Vice President Joe Biden bow their heads along with the family of Boston Marathon bombing victim Martin Richard, behind, during a remembrance ceremony at the finish line on Boylston Street in Boston, Tuesday, April 15, 2014. (AP Photo/Elise Amendola)