Boston Marathon Bombing: The Day After

A solitary runner heads down the banks of the Charles River in Cambridge, Mass. the morning after explosions killed three and injured more than 175 at the Boston Marathon.

Charles Krupa/AP

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A member of the Massachusetts National Guard patrols on an MBTA platform at the Back Bay Station as an investigation continues into yesterday's bombing.

Dominic Chavez/EPA, via Landov

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Boston police officers stand at barriers closing off Boylston Street, where two explosions struck near the finish line of the Boston Marathon April 15. A massive probe is underway Tuesday to find out who is behind the attack, and whether it was an act of an international terrorist group.

Stan Honda/AFP/Getty

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Blood is seen on the sidewalk in front of a candy store originally advertising a Marathon Monday sale.

Jessica Rinaldi/Reuters, via Landov

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Neighbors hug outside the home of the Richard family in the Dorchester neighborhood of Boston, the day after Martin Richard, 8, was killed in Monday's bombing.

Michael Dwyer/AP

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People have breakfast at a Boston cafe near the scene of a twin bombing at the Boston Marathon on April 16, 2013 in Boston, Massachusetts.

Spencer Platt/Getty

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A runner passes a police officer dressed in tactical gear, who blocks a road leading to the Boston Marathon route.

Charles Krupa/AP

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A worker returns a bag containing a runner's personal effects near the finish line of the Boston Marathon, as investigators continue to scour the scene for evidence of who was behind the bombing.

Charles Krupa

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A man reads the Washington Post's front page headline: "An Act of Terror in Boston."

Arno Burgi/dpa, via Landov

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President Obama speaks in the Brady Briefing Room of the White House in Washington, D.C. Obama on Tuesday. He has branded the Boston bombings a "cowardly" act of terror, but said it was still unclear if a foreign or domestic group or individual was behind the attacks. "This was a heinous and cowardly act," Obama said at the White House. "Any time bombs are used to target innocent civilians, it is an an act of terror."

Mandel Ngan/AFP/Getty

Boston Marathon Bombing: The Day After

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