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John Tlumacki/Globe Staff
Chaos ensued at the finish line of the Boston Marathon when two bombs exploded on Monday afternoon, injuring dozens and killing several.
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David L. Ryan/Globe Staff
The day began as a beautiful, sun-filled, and joyful time as runners completed the 26.2-mile trek from Hopkinton to Boston.
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David L. Ryan/Globe Staff
But the tenor of Marathon Day changed quickly when the first of two successive bombs exploded along Boylston Street just before 3 p.m.
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David L. Ryan/Globe Staff
A short time later, the once-joyous finish line scene had become a crime scene under lockdown.
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John Tlumacki/Globe Staff
The jolt of the first blast knocked this runner to the ground and prompted police to spring into action.
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John Tlumacki/Globe Staff
Seconds later, another explosion rocked the street several blocks away from the finish line.
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John Tlumacki/Globe Staff
To reach the injured, bystanders had to tear down a makeshift fence that had been built for the marathon.
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John Tlumacki/Globe Staff
Police and marathon officials struggled to remove the barriers.
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John Tlumacki/Globe Staff
The blast created a smoky haze that contributed to the confusion that reigned in the ensuing minutes.
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John Tlumacki/Globe Staff
This man comforted one of the victims along the sidewalk.
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John Tlumacki/Globe Staff
First responders sprang into action to help the injured people.
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John Tlumacki/Globe Staff
A marathon official helped the runner who was thrown to the ground by the initial blast.
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John Tlumacki/Globe Staff
The scene along the sidewalk near the bombing was gruesome.
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David L. Ryan/Globe Staff
Wheelchairs that were on standby for runners who needed help at the finish line were put into use for those injured by the blasts.
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John Tlumacki/Globe Staff
First responders wheeled away one of the injured on a stretcher.
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John Tlumacki/Globe Staff
Another injured person was carried away by first responders.
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Bill Greene/Globe Staff
Former Patriots offensive lineman Joe Andruzzi carried an injured woman away from the scene.
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John Tlumacki/Globe Staff
This woman dropped to her kneels in reflection after the blasts.
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Bill Greene/Globe Staff
The blasts were traumatic for many at the scene, and caused people to flee the area.
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Yoon S. Byun/Globe Staff
Runners who had not yet finished the race were stopped on Commonwealth Avenue.
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John Tlumacki/Globe Staff
The blasts blew out windows and left a trail of debris along Boylston Street.
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David L. Ryan/Globe Staff
The blasts left an indelible image on the Boston Marathon, which will likely be forever changed by Monday's tragedy.
