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  • Pressure-cooker bombs suspected in Boston blast add to reading list  

    Posted on April 16, 2013 at 6:03 AM

    Updated Tuesday, Apr 16 at 11:44 PM

    Federal agents zeroed in Tuesday 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.

    By JAY LINDSAY and EILEEN SULLIVAN / Associated Press
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