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Boston Marathon

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As runners prepare to tackle the Boston Marathon a year after the bombing at the finish line, security is being beefed up to prevent any copycat attacks.

As runners prepare to tackle the Boston Marathon a year after the bombing at the finish line, security is being beefed up to prevent any copycat attacks. The number of police officers protecting the marathon will be double last year's, and spectators will not be allowed to bring backpacks or other items such as strollers. Mark Strassmann reports.

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