Jack Amico

An anti-NATO protester, identified by friends as Jack Amico, is pushed by a Chicago police van, after several protesters tried to push the van to block it from moving through the crowd on Saturday, May 19, 2012. (Credit: CBS)

Police: Protesters Attacked Police Van Saturday, Gave Cop Concussion

Police Supt. Garry McCarthy said Sunday that a group of out-of-town protesters attacked a police van while hundreds of protesters were wandering around downtown Chicago for about 10 hours.

CBS Chicago–05/20/2012