They rushed the stage and began battling police , eventually spilling into the Loop district where they smashed windows and looted many businesses .
The concert - goers were not expecting opening acts at the concert and became enraged when Sly was not first band to perform .
concert - goers rushed the stage and began battling police , eventually spilling into the Loop district where they smashed windows and looted many businesses .
The concert - goers were not expecting opening acts at the concert and became enraged when Sly was not first band to perform .