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Clues Suggest Boston Suspects Took A Do-It-Yourself Approach

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This image from the Federal Bureau of Investigation shows the remains of a pressure cooker that the FBI says was part of one of the bombs that exploded during the Boston Marathon. (AP via FBI)
This image from the Federal Bureau of Investigation shows the remains of a pressure cooker that the FBI says was part of one of the bombs that exploded during the Boston Marathon. (AP via FBI)

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