Blasts kill 3, injure at least 144 at marathon

A Boston police officer wheeled an injured boy down Boylston Street as medical workers carried an injured runner.

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.

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.

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.

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.

Mark Wilson/Getty Images

President Obama spoke about the attacks from Washington, D.C.

The window of Marathon Sports on Boylston Street was shattered.

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.

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.

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.

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.

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.

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.

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.

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.

Alex Trautwig/Getty Images

Runners gathered near Kenmore Square.

Two officials ran away from the first explosion on Boylston Street.

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.

Winslow Townson/AP

A runner (center) reunited with loved ones near Copley Square.

Cell phone service was blocked to the area.

Alex Trautwig/Getty Images

Cell phone service was disrupted in the area.

A State Police officer inspected a suspicious package on Stuart Street.

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.

Josh Reynolds /AP

Two women walked away from the scene of the explosions.

Firefighters were surrounded by debris near the finish line.

Darren McCollester/Getty Images

Debris littered the area near the finish line.

Many injured were wheeled off on stretchers to area hospitals.

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.

John Tlumacki/Globe Staff

A marathon volunteer helped a runner who was knocked to the ground.

Marathon volunteers at the scene.

Alex Pearlman for the Boston Globe

Marathon volunteers at the scene.

Emergency personnel at the scene.

Steve Silva/Boston.com Staff

Emergency personnel at the scene.

Boston Police struggled to remove barricades to reach victims.

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.

Jim Davis/Globe Staff

A marathon runner walked through traffic at Boylston Street and Massachusetts Avenue.

//c.o0bg.com/rf/image_90x90/Boston/2011-2020/2013/04/15/BostonGlobe.com/Sports/Images/exp15.jpg Two explosions transform finish line into chaos

The FBI is investigating two powerful explosions near the Boston Marathon finish line, which transformed the scene into bloody chaos.

Interactive Map

//c.o0bg.com/rf/image_90x90/Boston/2011-2020/2013/04/16/BostonGlobe.com/Metro/Images/15explosionreports-4003--90x90.JPG How the Boston Marathon bombings unfolded

Two explosions rocked the area by the finish line during today’s Boston Marathon.

Medical workers swarmed the explosion site to aid injured people at the finish line of the 2013 Boston Marathon following explosions Monday.

opinion | JULIETTE KAYYEM

A spectator event with no doors

Public safety officials were on high alert, but no marathon can ever be totally secure.

//c.o0bg.com/rf/image_90x90/Boston/2011-2020/2013/04/15/BostonGlobe.com/National/Images/03663457-860--90x90.jpg Explosions an 'act of terror'

President Obama pledged the full weight of the federal government to find out who is responsible for the bombings.

VIDEO

Watch the explosion
Runners gathered near Kenmore Square after the explosions.

Runners try to make sense of chaos at marathon

VIDEOS

Scenes from the explosions

Map

Location of the explosions

More coverage of the blasts

Firefighters work on a blaze at the JFK Library.

Fire at JFK library likely unrelated

The director of the library said the problem there appeared to be a mechanical fire that had nothing to do with the Back Bay bombings.

Sports

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Red Sox 3, Rays 2

Ryan Dempster celebrated a defensive play in the seventh inning.

Red Sox walk off with win vs. Rays

Mike Napoli rescued the Red Sox with a walkoff hit in the ninth inning to back up a strong start by Ryan Dempster.

Metro

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Tim Chaloux , a senior at Pingree School, played varsity baseball.

Family, school mourn North Reading teen

Tim Chaloux, 18, was killed in a rollover crash on Route 128 early Saturday, State Police said.

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