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  • Images show what FBI says are parts of Boston bombsadd to reading list  

    Posted on April 17, 2013 at 7:46 AM

    Updated Thursday, Dec 5 at 10:34 AM

    FBI agents zeroed in Wednesday on how the Boston Marathon bombing was carried out - with kitchen pressure cookers packed with explosives, nails and other lethal shrapnel - but said they still didn't know who did it and why.

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