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Details of the blast that rocked one of Boston's biggest citywide celebrations are just starting to emerge. What we know so far is that at least two explosions erupted mere feet from the finish line, where well-wishers, families, friends, and officials waited to celebrate the triumph of fatigued and super-determined runners. For people on the ground, the scene was chaotic. And as they come to grips with the unprovoked horror that turned a day of commemoration into one of grief, we look through a small collection of heartbreaking photos from the devastating scene. 

(REUTERS/Dominick Reuter)

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(AP Photo/Elise Amendola)

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(Alex Trautwig/Getty Images)

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(AP Photo/Elise Amendola)

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(REUTERS/Jessica Rinaldi)

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(Alex Trautwig/Getty Images)