Boston Marathon Blasts Kill Three, Injure Over 140

Police and runners react after two explosions at the Boston Marathon.

An explosion erupts as runners near the finish line.

A woman is comforted by a man near a triage tent after explosions went off at the 117th Boston Marathon.

An injured victim is carried from the scene.

Bystanders tend to a man injured in the explosions.

Firefighters take up a position on Boyltson Street, near the finish line, after the two bombs exploded.

An injured man is lifted into an ambulance.

U.S. President Barack Obama pauses as he makes a statement on the Boston Marathon blasts.

Public safety officials evacuate the scene after the explosions.

Debris is seen along Boylston Street in the aftermath of the blasts.

Unclaimed finish-line bags are left near the scene of the twin bombings.