Photos: Moment of silence for Boston

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Boston Marathon Moment of Silence
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Boston Marathon Moment of Silence
People raise their arms while observing a moment of silence and forming a human chain from a makeshift memorial for fallen MIT police officer Sean Collier to a campus police station, at MIT, in Cambridge, Mass., Monday, April 22, 2013. Collier was fatally shot on the MIT campus Thursday, April 18, 2013. Authorities allege that Boston Marathon bombing suspects Tamerlan and Dzhokhar Tsarnaev were responsible. (AP Photo/Steven Senne)