Four cops injured, one stabbed at NATO summit

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A Chicago police officer suffered a stab wound to the leg, Sunday, and three others were injured during a day of protests around the NATO summit.

Chicago Police Superintendent Garry McCarthy did not know what was used to stab the officer.

Overall, officers arrested more than 45 individuals during a day of marches and protests that turned violent in the evening hours.

McCarthy commended his officers for showing "dramatic restraint" in the face of taunts and violence.

"I'm proud to be in charge of this department," McCarthy said during an evening press briefing.

The superintendent said his department was mostly prepared for the melee that erupted at 22nd and Michigan Avenue.

Officers knew that a group of Black Bloc anarchists planned to storm McCormick place after a group of war veterans finished its demonstration there.

McCarthy said officers used batons on the aggressive protesters because they were assaulted.

The twitter feed of Occupy Chicago was filled with differing sentiment. Many of the protesters and their supporters decried the brutality of the police officers and pointed to a lop-sided ratio of police to protesters.

Police stood by their use of force.

McCarthy said his department was tipped off that someone had assembled an improvised explosive device (IED) that was stored in a back pack near the demonstration at McCormick Place. Officers found a pack that contained an unknown liquid. The liquid is being tested.