
Day after Marathon blasts, investigation continues

Remains of a backpack the FBI says contained one bomb.
ASSOCIATED PRESS
| April 16, 2013

This image shows the remains of a pressure cooker that the FBI says was part of one of the bombs.
Associated Press
| April 16, 2013

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.
Yoon S. Byun/globe staff
| April 16, 2013

Garvey Park in Dorchester was nearly filled with people during the vigil for Martin Richard, who was killed in Monday’s blasts.
Yoon S. Byun/globe staff
| April 16, 2013

Sam Galvin of West Roxbury added candles to a makeshift memorial on the barricades blocking off Boylston Street.
Aram Boghosian for The Boston Globe
| April 16, 2013

Sisters Justine Lescarbeau (left) and Jocelyn Lescarbeau, both of Boston, sign a banner during a vigil and memorial on Boston Common.
Essdras M. Suarez/Globe Staff
| April 16, 2013

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.
Julio Cortez/AP
| April 16, 2013

Members of the military walked along Boylston Street near the finish line of the Boston Marathon.
Aram Boghosian for The Boston Globe
| April 16, 2013
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The Red Sox had a moment of silence for victims before a game in Cleveland, playing the Indians at Progressive Field.
Mark Duncan/AP
| April 16, 2013
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Sox second baseman Dustin Pedroia walked past a sign from an Indians fan in the dugout.
Mark Duncan
| April 16, 2013

Investigators were combing through the aftermath of the deadly Boston Marathon terrorist attack Tuesday.
John Tlumacki/Globe Staff
| April 16, 2013

Two people stood above 755 Boylston St.
John Tlumacki/Globe Staff
| April 16, 2013

A wide view of the scene Tuesday.
John Tlumacki/Globe Staff
| April 16, 2013

The scene outside of Marathon Sports, the site of the first bomb explosion.
John Tlumacki/Globe Staff
| April 16, 2013

Police tape blocked off access to the area.
John Tlumacki/Globe Staff
| April 16, 2013

A woman looked down Boylston Street Tuesday, toward the finish line of the Boston Marathon and the site of deadly bombings a day earlier.
MATTHEW CAVANAUGH/EPA
| April 16, 2013

A Boston Police officer stood on Boylston Street on Tuesday.
MATTHEW CAVANAUGH/EPA
| April 16, 2013

Boston Police Commissioner Edward Davis spoke along with other local and federal officials Tuesday morning.
Bill Greene/Globe Staff
| April 16, 2013

Senator Elizabeth Warren, Boston Mayor Thomas M. Menino, Governor Deval Patrick, and FBI special agent in charge Richard DesLauriers spoke at the press conference.
Elise Amendola/Associated Press
| April 16, 2013

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."
Susan Walsh/Associated Press
| April 16, 2013

Roads around Boylston Street in Boston's Back Bay were closed and considered an active crime scene on Tuesday morning.
Dina Rudick/Globe Staff
| April 16, 2013

Another look at the scene around Boylston Street on Tuesday.
Dina Rudick/Globe Staff
| April 16, 2013

Boston Police officers stood near the finish line of the Boston Marathon on Tuesday morning.
JUSTIN LANE/EPA
| April 16, 2013

A police officer stood guard at the corner of Boylston Street and Arlington Street early Tuesday.
Darren McCollester/Getty Images
| April 16, 2013

Neighbors left flowers outside the Dorchester home of the eight-year-old killed during the attack.
Evan Allen/Globe staff
| April 16, 2013

A military police officer checked the identification of a man on Massachusetts Avenue on Tuesday morning.
Darren McCollester/Getty Images
| April 16, 2013

Overnight, a wave of law enforcement officials swarmed a home of a "person of interest" on Ocean Avenue in Revere.
Matthew J. Lee/Globe Staff
| April 16, 2013

FBI and Homeland Security agents were seen entering the Water’s Edge apartment complex at 364 Ocean Ave.
Matthew J. Lee/Globe Staff
| April 16, 2013

Police units assembled along the Boston Public Garden on Tuesday morning.
Darren McCollester/Getty Images
| April 16, 2013

Special police units assembled in the Boston Common on Tuesday morning.
Darren McCollester/Getty Images
| April 16, 2013