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Manhunt on for bombing suspect

The surviving Boston bomb suspect was identified as Dzhokhar A. Tsarnaev, 19, of Cambridge, Mass.

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Charles Krupa/AP Photo |

Police in tactical gear surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013.

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Matt Rourke/AP Photo |

Police officers walk near a crime scene Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings.

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Charles Krupa/AP Photo |

A woman runs for cover as police surround a home while searching for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013.

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Matt Rourke/AP Photo |

Police officers aim their weapons Friday, April 19, 2013, in Watertown, Mass. A tense night of police activity that left a university officer dead on campus just days after the Boston Marathon bombings.

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Craig Ruttle/AP Photo |

A police official inspects an object that was picked up by a remote control device, left, following a shootout with suspects in the Boston Marathon bombings early Friday, April 19, 2013, in Watertown, Mass.

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Charles Krupa/AP Photo |

Police in tactical gear arrive on an armored police vehicle as they surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013.

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Julio Cortez/AP Photo |

Officials search an area at Massachusetts Institute of Technology following reports of a shooting, Friday, April 19, 2013, in Boston. State police say a campus police officer at the school has suffered life-threatening injuries in a shooting on the campus outside Boston. State police spokesman Dave Procopio says the shooting took place about 10:30 p.m. outside an MIT building.

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Julio Cortez/AP Photo |

Officials secure an area in Watertown, Mass., Friday, April 19, 2013. Reports of explosives being detonated and police are telling reporters to turn off their cell phones.

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Charles Krupa/AP Photo |

Police in tactical gear surround an apartment building while looking for a suspect in the Boston Marathon bombings in Watertown, Mass., Friday, April 19, 2013.

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Charles Krupa/AP Photo |

A woman carries a girl from their home as a SWAT team searching for a suspect in the Boston Marathon bombings enters the building in Watertown, Mass., Friday, April 19, 2013.

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Matt Rourke/AP Photo |

Law enforcement search for the suspect in the Boston Marathon bombings, Friday, April 19, 2013, in Watertown, Mass. Gunfire erupted Friday night amid the manhunt for the surviving suspect in the Boston Marathon bombing, and police in armored vehicles and tactical gear rushed into the Watertown neighborhood in a possible break in the case.

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Robert Ray/AP Photo |

This still frame from video shows Boston Marathon bombing suspect Dzhokhar Tsarnaev visible through an ambulance after he was captured in Watertown, Mass., Friday, April 19, 2013. A 19-year-old college student wanted in the Boston Marathon bombings was taken into custody Friday evening after a manhunt that left the city virtually paralyzed and his older brother and accomplice dead.