Illinois State Police stand guard on Michigan Ave. during a protest march as a part of this weekend's NATO summit Sunday, May 20, 2012, in Chicago. Security has been high throughout the city in preparation for the NATO summit, where delegations from about 60 countries will discuss the war in Afghanistan and European missile defense. (AP Photo/Robert Ray)

Associated Press
Illinois State Police stand guard on Michigan Ave. during a protest march as a part of this weekend's NATO summit Sunday, May 20, 2012, in Chicago.  Security has been high throughout the city in preparation for the NATO summit, where delegations from about 60 countries will discuss the war in Afghanistan and European missile defense. (AP Photo/Robert Ray)
Illinois State Police stand guard on Michigan Ave. during a protest march as a part of this weekend's NATO summit Sunday, May 20, 2012, in Chicago. Security has been high throughout the city in preparation for the NATO summit, where delegations from about 60 countries will discuss the war in Afghanistan and European missile defense. (AP Photo/Robert Ray)
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