May 21, 2012 - Chicago, Ill, U.S - A protestor writes in chalk on the road during NATO Summit protests in downtown Chicago, Ill. on Monday, May 21, 2012. (Credit Image: © Andrew A. Nelles/ZUMAPRESS.com)
May 21, 2012 - Chicago, Ill, U.S - Protestors push up against a police line during NATO Summit protests in downtown Chicago, Ill. on Monday, May 21, 2012. (Credit Image: © Andrew A. Nelles/ZUMAPRESS.com)
May 21, 2012 - Chicago, Ill, U.S - Protestors march during NATO Summit protests in downtown Chicago, Ill. on Monday, May 21, 2012. (Credit Image: © Andrew A. Nelles/ZUMAPRESS.com)
May 21, 2012 - Chicago, Ill, U.S - Protestors including Chris Smith, center, of Indianapolis, Ind., march during NATO Summit protests in downtown Chicago, Ill. on Monday, May 21, 2012. (Credit Image: © Andrew A. Nelles/ZUMAPRESS.com)
May 21, 2012 - Chicago, Ill, U.S - Chicago Police officers on bicycles form a barrier around protestors during NATO Summit protests in downtown Chicago, Ill. on Monday, May 21, 2012. (Credit Image: © Andrew A. Nelles/ZUMAPRESS.com)
May 21, 2012 - Chicago, Ill, U.S - Protestors gather at S. Michigan Ave. and E. Jackson Blvd. during NATO Summit protests in downtown Chicago, Ill. on Monday, May 21, 2012. (Credit Image: © Andrew A. Nelles/ZUMAPRESS.com)
Where some of the photos have been published:
Link: http://newsfeed.time.com/2012/05/20/at-nato-summit-in-chicago-police-clash-with-protesters/
Link: http://www.bloomberg.com/slideshow/2012-05-21/nato-protests-turn-violent-in-chicago.html#slide1