Boston Marathon Explosions

For the first responders, every day, for the 350 days in between the marathons, they arrived at work, not knowing if they would return home.

Two days after the explosions near the finish line of the Boston Marathon, investigations continue across the city of Boston.

Photos of Boston, on the day after the Boston Marathon bombings.

Coverage of the explosions at the Boston Marathon, the day after.

The three bombings at the Boston Marathon, which left 2 dead and 23 injured, was likely the work of amateur terrorists, says Max Abrahms, terrorism expert and fellow at John Hopkins.

Boston Marathon Explosion: photos from the aftermath, and of the explosion.

Boston Marathon explosions: Two explosions near the end of the marathon killed 2 and injured 23, according to Boston police.