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/Charles Rex Arbogast)

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/Charles Rex Arbogast)
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/Charles Rex Arbogast)
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