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Remains of a backpack the FBI says contained one bomb.
This image shows the remains of a pressure cooker that the FBI says was part of one of the bombs.
Yoon S. Byun/globe staff
Emily 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.
Garvey Park in Dorchester was nearly filled with people during the vigil for Martin Richard, who was killed in Monday’s blasts.
Aram Boghosian for The Boston Globe
Sam Galvin of West Roxbury added candles to a makeshift memorial on the barricades blocking off Boylston Street.
Essdras M. Suarez/Globe Staff
Sisters Justine Lescarbeau (left) and Jocelyn Lescarbeau, both of Boston, sign a banner during a vigil and memorial on Boston Common.
Lizzie 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.
Members of the military walked along Boylston Street near the finish line of the Boston Marathon.
The Red Sox had a moment of silence for victims before a game in Cleveland, playing the Indians at Progressive Field.
Sox second baseman Dustin Pedroia walked past a sign from an Indians fan in the dugout.
John Tlumacki/Globe Staff
Investigators were combing through the aftermath of the deadly Boston Marathon terrorist attack Tuesday.
Two people stood above 755 Boylston St.
A wide view of the scene Tuesday.
The scene outside of Marathon Sports, the site of the first bomb explosion.
Police tape blocked off access to the area.
A woman looked down Boylston Street Tuesday, toward the finish line of the Boston Marathon and the site of deadly bombings a day earlier.
A Boston Police officer stood on Boylston Street on Tuesday.
Bill Greene/Globe Staff
Boston Police Commissioner Edward Davis spoke along with other local and federal officials Tuesday morning.
Elise Amendola/Associated Press
Senator Elizabeth Warren, Boston Mayor Thomas M. Menino, Governor Deval Patrick, and FBI special agent in charge Richard DesLauriers spoke at the press conference.
Susan Walsh/Associated Press
Speaking 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."
Dina Rudick/Globe Staff
Roads around Boylston Street in Boston's Back Bay were closed and considered an active crime scene on Tuesday morning.
Another look at the scene around Boylston Street on Tuesday.
Boston Police officers stood near the finish line of the Boston Marathon on Tuesday morning.
Darren McCollester/Getty Images
A police officer stood guard at the corner of Boylston Street and Arlington Street early Tuesday.
Evan Allen/Globe staff
Neighbors left flowers outside the Dorchester home of the eight-year-old killed during the attack.
A military police officer checked the identification of a man on Massachusetts Avenue on Tuesday morning.
Matthew J. Lee/Globe Staff
Overnight, a wave of law enforcement officials swarmed a home of a "person of interest" on Ocean Avenue in Revere.
FBI and Homeland Security agents were seen entering the Water’s Edge apartment complex at 364 Ocean Ave.
Darren McCollester/Getty Images
Police units assembled along the Boston Public Garden on Tuesday morning.
Special police units assembled in the Boston Common on Tuesday morning.
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