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Runners start the Chicago Marathon in 2012. Police have not stated the security measures they are taking for the 2013 Chicago Marathon on Sunday. The marathon is the first World Marathon Major in the United States since the Boston Marathon bombings last April and will be the most closely watched.

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Tease photo

Tight security promised at Chicago Marathon

Fences are going up, streets are closing down and trim athletes are flying in from around the world ahead of Sunday’s Chicago Marathon.

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