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Tape, pictures will help lead to big break in Boston case, says analyst

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Top Talkers: The Morning Joe panel – including the BBC's Katty Kay, Mike Barnicle, economic analyst Steve Rattner, Time's Mark Halperin and NBC News' Security Analyst Michael Leiter -- discuss new details in the investigation of the two bombs that exploded at Monday's Boston Marathon, including the design of the bombs and how they were detonated. The panel also discusses the victims of the explosions and their families.