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Protesters gather in Daley Plaza near Chicago police officer Ruzas during a demonstration in advance of this weekend's NATO summit, Friday, May 18 2012, in Chicago. (AP Photo/Charles Rex Arbogast)

Associated Press
Protesters gather in Daley Plaza near Chicago police officer Ruzas during a demonstration in advance of this weekend's NATO summit, Friday, May 18 2012, in Chicago. (AP Photo/Charles Rex Arbogast)
Protesters gather in Daley Plaza near Chicago police officer Ruzas during a demonstration in advance of this weekend's NATO summit, Friday, May 18 2012, in Chicago. (AP Photo/Charles Rex Arbogast)
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