Protesters swarm on final day of NATO summit

Associated Press
A protester is helped after sustaining an injury at a protest march and rally during this weekend's NATO summit in Chicago Sunday, May 20, 2012 in Chicago. (AP Photo/Nam Y. Huh)

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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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