![A Boston police officer wheeled an injured boy down Boylston Street as medical workers carried an injured runner.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/mexplosion%20(7).r.jpg)
Charles Krupa/Associated Press
A Boston police officer wheeled an injured boy down Boylston Street as medical workers carried an injured runner.
![People ran away from explosions on Boylston Street, near the Boston Marathon finish line.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/emarathon%20(9).r.jpg)
Kenshin Okubo/The Daily Free Press
People ran away from explosions on Boylston Street, near the Boston Marathon finish line.
![A man walked away from the scene of the explosions, his clothing ripped.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/emarathon%20(5).r.jpg)
Kenshin Okubo/The Daily Free Press
A man walked away from the scene of the explosions, his clothing ripped.
![Two people walked down the sidewalk as Boston police cleared Copley Square.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/emarathon%20(10).r.jpg)
Elise Amendola/AP
Two people were on the sidewalk as Boston police cleared Copley Square.
![President Barack Obama spoke about the attacks from Washington, D.C.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/emarathon%20(8).r.jpg)
Mark Wilson/Getty Images
President Obama spoke about the attacks from Washington, D.C.
![The window of Marathon Sports on Boylston Street was shattered.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/emarathon.r.jpg)
JESSICA RINALDI/Reuters
The window of Marathon Sports on Boylston Street was shattered.
![Two large explosions were reported on Boylston Street, where crowds gathered near the Boston Marathon finish line.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/exp2.r.jpg)
David L. Ryan/Globe Staff
The blasts happened on Boylston Street, where crowds gathered near the marathon's finish line.
![The area around the finish line was evacuated.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Sports/Images/exp1a.r.jpg)
David L. Ryan/Globe Staff
The area around the finish line was evacuated.
![Justine Franco of Montpelier, Vt., held a sign near Copley Square looking for her missing friend who was running her first Boston Marathon.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/emarathon%20(4).r.jpg)
Winslow Townson/AP
Justine Franco of Montpelier, Vt., held a sign near Copley Square looking for her missing friend who was running her first Boston Marathon.
![A man carried a small American flag near Kenmore Square.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/emarathon%20(6).r.jpg)
Alex Trautwig/Getty Images
A man carried an American flag near Kenmore Square.
![Police officers with their guns drawn after the first explosion heard the second blast down the street.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/mexplosion%20(2).r.jpg)
John Tlumacki/Globe Staff
Police officers with their guns drawn reacted to the second blast down the street.
![A second explosion went off as a runner was blown to the ground by the first.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/mexplosiongallery%20(3).r.jpg)
John Tlumacki/Globe Staff
A second explosion occurred seconds after the first.
![Katherine Swierk (left) hugged her aunt Terry Days (center) and friend Jocelyn Cacio near Copley Square.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/explomarathon%20(5).r.jpg)
John Blanding/Globe Staff
Katherine Swierk (left) hugged her aunt Terry Days (center) and friend Jocelyn Cacio near Copley Square.
![Runners gathered near Kenmore Square.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/emarathon%20(7).r.jpg)
Alex Trautwig/Getty Images
Runners gathered near Kenmore Square.
![Two officials ran away from the first explosion on Boylston Street.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/mexplosiongallery%20(2).r.jpg)
John Tlumacki/Globe Staff
Two officials ran away from the first explosion on Boylston Street.
![A runner, center, reunited with loved ones near Copley Square.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/explomarathon%20(4).r.jpg)
Winslow Townson/AP
A runner (center) reunited with loved ones near Copley Square.
![Cell phone service was blocked to the area.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/explomarathon%20(1).r.jpg)
Alex Trautwig/Getty Images
Cell phone service was disrupted in the area.
![A State Police officer inspected a suspicious package on Stuart Street.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/emarathon%20(2).r.jpg)
Matthew J. Lee/Globe Staff
A State Police officer inspected a suspicious package on Stuart Street.
![Two women walked away from the scene of the explosions.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/emarathon%20(1).r.jpg)
Josh Reynolds /AP
Two women walked away from the scene of the explosions.
![Firefighters were surrounded by debris near the finish line.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/explomarathon%20(2).r.jpg)
Darren McCollester/Getty Images
Debris littered the area near the finish line.
![Many injured were wheeled off on stretchers to area hospitals.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/exp4.r.jpg)
David L. Ryan/Globe Staff
Many injured were taken by stretcher to area hospitals.
![A marathon volunteer helped a runner knocked to the ground by the explosions.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/mexplosiongallery%20(1).r.jpg)
John Tlumacki/Globe Staff
A marathon volunteer helped a runner who was knocked to the ground.
Alex Pearlman for the Boston Globe
Marathon volunteers at the scene.
![Emergency personnel at the scene.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/copleyexplosion.r.jpg)
Steve Silva/Boston.com Staff
Emergency personnel at the scene.
![Boston Police struggled to remove barricades to reach victims.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/mexplosion%20(5).r.jpg)
John Tlumacki/Globe Staff
Boston Police struggled to remove barricades to reach victims.
![A Boston Marathon runner wandered through traffic at Boylston Street and Massachusetts Avenue.](http://www.bostonglobe.com/rf/image_r/Boston/2011-2020/2013/04/15/BostonGlobe.com/Metro/Images/mexplosion%20(6).r.jpg)
Jim Davis/Globe Staff
A marathon runner walked through traffic at Boylston Street and Massachusetts Avenue.