Police continue to investigate what was described as a mob disturbance that erupted at the Ford City Mall in Chicago Saturday. It started after an autograph session by the rap group Mindless Behavior and ended with victims being sent to the hospital. ABC's Eric Horng reports there were Chicago police officers inside the mall but witnesses say they were outnumbered. Signs were thrown, vehicles were damaged in the parking lot, they reportedly jumped on top of cars, and as many as 20 people were arrested and at least two people were treated for minor injuries. Authorities were trying to determine why the disturbance broke out.
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