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Bombs packed metal, nails, BBs

Updated: April 17, 2013, 3:57 AM ET
ESPN.com news services

BOSTON -- 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.

The FBI and other law enforcement agencies repeatedly appealed to the public to come forward with photos, videos or anything suspicious they might have seen or heard.

"The range of suspects and motives remains wide open," Richard DesLauriers, FBI agent ...

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