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.
Dina Rudick/Globe Staff
Roads around Boylston Street in Boston's Back Bay were closed and considered an active crime scene on Tuesday morning.
Dina Rudick/Globe Staff
Another look at the scene around Boylston Street on Tuesday.
JUSTIN LANE/EPA
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.
Darren McCollester/Getty Images
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.
Matthew J. Lee/Globe Staff
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.
Darren McCollester/Getty Images
Special police units assembled in the Boston Common on Tuesday morning.
JOHN TLUMACKI/GLOBE STAFF
A woman received help following the first of two explosions on Boylston Street Monday.
DAVID L. RYAN/GLOBE STAFF
Just seconds after the first explosion rocked the area near the finish line, there was a second blast a few blocks away on Boylston Street.
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