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Kelvin Ma/Bloomberg via AP Photo1 of 10
First responders rush to where two explosions occurred along the final stretch of the Boston Marathon on Boylston Street in Boston, Mass., on Monday, April 15. More than 80 were injured and two killed in the explosions that rocked the packed streets surrounding the marathon's finish line.
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AP Photo/WBZTV2 of 10
In this image from video provided by WBZ TV, spectators and runners run from the twin explosions that shook the finish line of the Boston Marathon, Monday, April 15, in Boston.
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David L. Ryan/The Boston Globe via Getty Images3 of 10
Smoke rises from an explosion that went off near the finish line of the 117th Boston Marathon on April 15.
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AP Photo/Charles Krupa4 of 10
Medical workers aid injured people at the finish line of the 2013 Boston Marathon on April 15.
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David L. Ryan/The Boston Globe via Getty Images5 of 10
Emergency personnel respond to the scene of the first explosion that went off near the finish line of the 117th Boston Marathon on April 15.
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David L. Ryan/The Boston Globe via Getty Images6 of 10
There was smoke and panic in the street as emergency personnel responded to the scene after two explosions went off near the finish line of the 117th Boston Marathon on April 15.
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AP Photo/Charles Krupa7 of 10
Medical workers aid injured people at the finish line of the 2013 Boston Marathon following explosions in Boston, Monday, April 15.
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John Tlumacki/The Boston Globe via Getty Images8 of 10
A person who was injured in the first explosion is wheeled across the finish line of the Boston Marathon.
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AP Photo/Charles Krupa9 of 10
Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion on Monday, April 15.
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AP Photo/Elise Amendola10 of 10Next: 50 Must-See Weather Photos from 2012
One of the blast sites on Boylston Street near the finish line of the 2013 Boston Marathon is investigated and guarded by police in the wake of two blasts in Boston on Monday, April 15.