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Boston Marathon Bombing

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John Tlumacki/The Boston Globe |

An injured woman is tended to at the scene of the first explosion on Boylston Street near the finish line of the Boston Marathon, Monday, April 15, 2013.

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John Tlumacki/The Boston Globe |

A man applies a tourniquet to a man's leg shortly after the first explosion near the finish line of the Boston Marathon, Monday, April 15, 2013.

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David L. Ryan/The Boston Globe |

Moments after the first explosion near the finish line of the Boston Marathon, smoke is seen in the background where a second explosion occurred, Monday, April 15, 2013.

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David L. Ryan/The Boston Globe |

The scene near the finish line of the Boston Marathon after explosions, Monday, April 15, 2013.

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John Tlumacki/The Boston Globe |

The scene moments after the first explosion near the finish line of the Boston Marathon, Monday, April 15, 2013.

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John Tlumacki/The Boston Globe |

Boston police officers just after an explosion near the finish line of the Boston Marathon, Monday, April 15, 2013.

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John Tlumacki/The Boston Globe |

A man tries to comfort a victim near the scene of the first explosion near the finish line of the Boston Marathon, Monday, April 15, 2013.

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Charles Krupa/AP Photo |

Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013.

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David L. Ryan/The Boston Globe |

Medical workers aid an injured man at the 2013 Boston Marathon following an explosion in Boston, Monday, April 15, 2013.

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Elise Amendola/AP Photo |

An unidentified Boston Marathon runner is comforted as she cries in the aftermath of two blasts which exploded near the finish line of the Boston Marathon in Boston, Monday, April 15, 2013.

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WBZTV/AP Photo |

In this image from video provided by WBZ TV, spectators and runners run from what was described as twin explosions that shook the finish line of the Boston Marathon, Monday, April 15, 2013, in Boston. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts.

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Kenshin Okubo, The Daily Free Press/AP Photo |

People react to an explosion at the 2013 Boston Marathon in Boston, Monday, April 15, 2013. Two explosions shattered the euphoria of the Boston Marathon finish line on Monday, sending authorities out on the course to carry off the injured while the stragglers were rerouted away from the smoking site of the blasts.