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Boston Marathon

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It is the world’s oldest annual marathon, but what happened in Boston on April 15, 2013 changed the historic event forever

It is the world’s oldest annual marathon, but what happened in Boston on April 15, 2013 changed the historic event forever. Three people were killed and more than 260 were injured after a pair of bombs detonated near the finish line. Among the most severely wounded that day was Adrianne Haslet-Davis, a professional ballroom dancer who lost a part of her left leg. Her three-year recovery has been painful and difficult, but resilience and determination have her standing, even dancing, again. Norah O'Donnell reports.

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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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