Protesters have clashed with police as thousands of activists took part in an anti-NATO demonstration in Chicago, where the military bloc's summit drawing to a close. At least 60 people have been arrested. The clashes occurred as the demonstrators were trying to push their way through a police line to the site of the meeting. Protesters threw plastic bottles and paint balloons at police which used batons against them. At least 12 people were injured. Prior to the incident, the march was largely peaceful. RT's Anastasia Churkina reports.