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Boston Marathon bombing

Photo: Hundreds of police officers wait to board Boston area buses; LED signs read 'Rest In Peace' - @jessbidgood

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Boston Marathon bombing

More than 10,000 people gathered at memorial for slain MIT Police Officer Sean A. Collier - @BostonDotCom

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Boston Marathon bombing

Carney: 'Analysis of terror threats are always being assessed and reassessed; Boston...has many angles' case just starting - @WestWingReport

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Boston Marathon bombing

At memorial for MIT officer, Vice President Biden calls the bombing suspects '2 twisted, perverted, cowardly knockoff jihadis here in Boston' - @jessbidgood

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Boston Marathon bombing

Vice President Biden to Collier family: You'll know it's going to be okay when you get a smile before a tear when you think of Sean - @fox25news

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Boston Marathon bombing

Vice President Joe Biden speaks at memorial service for slain MIT police officer Sean Collier - live video

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Boston Marathon bombing

Sen. Elizabeth Warren of Mass. at the memorial for slain MIT officer: Today we member officer Sean Collier; he was a model for how a police officer should serve - live video

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Boston Marathon bombing

Public memorial service held for slain MIT officer Sean Collier - @NBCNews

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Boston Marathon bombing

Photo: Long line of officers begin making their way across Briggs Field at MIT for memorial for slain police officer Sean Collier - via @cbsboston

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Boston Marathon bombing

Photo: Police officers line up outside private memorial for slain MIT police officer Sean Collier - via @GlobeBallou

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Boston Marathon bombing

Police commissioner says he believes Boston bombing suspects were ready for 2nd attack at time of shootout - @AP

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Boston Marathon bombing

Hospital: 15 police officers taken to Boston emergency room for 'injuries sustained in last night's police activity' related to the bombing investigation - @WBUR

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Boston Marathon bombing

Nashua bomb squad arrived. Presser in ten mins, after dogs sweep for bombs. @bostondotcom pic.twitter.com/cJAAQGCjPe

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Boston Marathon bombing

UK Foreign Office issues travel advice to Britons regarding restrictions in place around the Boston area - @itvnews

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Boston Marathon bombing

Roommate of fallen MIT police officer puts up American flag in front home - @

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MIT shooting, April 18, 2013

Black bunting at MIT police headquarters in honor of killed officer Sean Collier - @ToddKazakiewich

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Boston Marathon bombing

Several massive armored trucks pulling up here in Cambridge. #cnn pic.twitter.com/d7bumify0h

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Boston Marathon bombing

MIT police officer said to have been shot, killed by Boston Marathon bombing suspects identified as Sean Collier by police chief - @AP

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Boston Marathon bombing

Correction: 2 people in custody at house on Norfolk St, Cambridge; area secured by dozens of FBI agents - @NBCNews (corrects town name)

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Boston Marathon bombing

Update: 2 people in custody at house on Norfolk St, Cambridge; area secured by dozens of FBI agents - @NBCNews (corrects location)

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