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Memorial to slain MIT officer unveiled
Tim Brignolo, of the Massachusetts Institute of Technology facilities department, waters the flowers at a temporary memorial to slain MIT police Officer Sean Collier in Cambridge, Mass., Friday, Oct. 18, 2013. The granite memorial was unveiled on the MIT campus Friday morning. Authorities allege the Boston Marathon bombing suspects shot and killed Collier on April 18 to get his gun as they tried to make their escape. (AP Photo/Elise Amendola)

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