Protesters swarm on final day of NATO summit

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)

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Demonstrators launched another round of protests May 21 in the final hours of the NATO summit, marching through an unusually quiet downtown Chicago to the headquarters of Boeing and President Barack Obama's campaign.

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