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ASSOCIATED PRESSRemains of a backpack the FBI says contained one bomb.
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Associated PressThis image shows the remains of a pressure cooker that the FBI says was part of one of the bombs.
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Yoon S. Byun/globe staffEmily Gillis, 7, her brother Conor, 4, of Dorchester, and their cousin Benjamin McCormick, 8, of Milton attended a vigil for blast victim Martin Richard at Garvey Park in Dorchester.
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Yoon S. Byun/globe staffGarvey Park in Dorchester was nearly filled with people during the vigil for Martin Richard, who was killed in Monday’s blasts.
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Aram Boghosian for The Boston GlobeSam Galvin of West Roxbury added candles to a makeshift memorial on the barricades blocking off Boylston Street.
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Essdras M. Suarez/Globe StaffSisters Justine Lescarbeau (left) and Jocelyn Lescarbeau, both of Boston, sign a banner during a vigil and memorial on Boston Common.
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Julio Cortez/APLizzie Lee, 56, of Lynwood, Wash., who had participated in her first Boston Marathon, holds a candle and a flower at a vigil at Boston Common.
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Aram Boghosian for The Boston GlobeMembers of the military walked along Boylston Street near the finish line of the Boston Marathon.
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Mark Duncan/APThe Red Sox had a moment of silence for victims before a game in Cleveland, playing the Indians at Progressive Field.
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Mark DuncanSox second baseman Dustin Pedroia walked past a sign from an Indians fan in the dugout.
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John Tlumacki/Globe StaffInvestigators were combing through the aftermath of the deadly Boston Marathon terrorist attack Tuesday.
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John Tlumacki/Globe StaffTwo people stood above 755 Boylston St.
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John Tlumacki/Globe StaffA wide view of the scene Tuesday.
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John Tlumacki/Globe StaffThe scene outside of Marathon Sports, the site of the first bomb explosion.
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John Tlumacki/Globe StaffPolice tape blocked off access to the area.
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MATTHEW CAVANAUGH/EPAA woman looked down Boylston Street Tuesday, toward the finish line of the Boston Marathon and the site of deadly bombings a day earlier.
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MATTHEW CAVANAUGH/EPAA Boston Police officer stood on Boylston Street on Tuesday.
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Bill Greene/Globe StaffBoston Police Commissioner Edward Davis spoke along with other local and federal officials Tuesday morning.
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Elise Amendola/Associated PressSenator Elizabeth Warren, Boston Mayor Thomas M. Menino, Governor Deval Patrick, and FBI special agent in charge Richard DesLauriers spoke at the press conference.
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Susan Walsh/Associated PressSpeaking Tuesday afternoon at the White House, President Obama said, "We do not know whether this is an act of an organization, or an individual, or individuals."
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Dina Rudick/Globe StaffRoads around Boylston Street in Boston's Back Bay were closed and considered an active crime scene on Tuesday morning.
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Dina Rudick/Globe StaffAnother look at the scene around Boylston Street on Tuesday.
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JUSTIN LANE/EPABoston Police officers stood near the finish line of the Boston Marathon on Tuesday morning.
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Darren McCollester/Getty ImagesA police officer stood guard at the corner of Boylston Street and Arlington Street early Tuesday.
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Evan Allen/Globe staffNeighbors left flowers outside the Dorchester home of the eight-year-old killed during the attack.
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Darren McCollester/Getty ImagesA military police officer checked the identification of a man on Massachusetts Avenue on Tuesday morning.
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Matthew J. Lee/Globe StaffOvernight, a wave of law enforcement officials swarmed a home of a "person of interest" on Ocean Avenue in Revere.
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Matthew J. Lee/Globe StaffFBI and Homeland Security agents were seen entering the Water’s Edge apartment complex at 364 Ocean Ave.
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Darren McCollester/Getty ImagesPolice units assembled along the Boston Public Garden on Tuesday morning.
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Darren McCollester/Getty ImagesSpecial police units assembled in the Boston Common on Tuesday morning.