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  • Was al Qaeda magazine the blueprint for Boston bombers' pressure cooker explosions?add to reading list  

    Posted on April 23, 2013 at 10:49 AM

    Many people are asking two questions about the Tsarnaev brothers -- one, why did they become radicals? And, the other: where did they learn to make bombs like the ones that exploded at the Boston Marathon?

    By CBS News
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