The Boston Marathon: From Triumph to Tragedy

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Tragedy Unfolds

A day of celebration quickly turned to peril after two explosives were detonated near the finish line of Monday's Boston Marathon. At least three people were killed and 130 were reported injured, according to police, who are still on the scene investigating what prompted this tragic event. Warning: some of the images are of a graphic nature. Britt Middleton

Monday morning, about 27,000 runners set out to finish the 26.2 mile course. Now in its 117th year, the Boston Marathon is the world's oldest. (Photo:   David L. Ryan/The Boston Globe via Getty Images)