A 15-year-old female, 14-year-old male, two 16-year-old males, and an 18-year-old female also have been arrested so far.

An 11-year-old girl was arrested and charged with felony aggravated battery of a victim 60 or older and felony robbery of a victim 60 or older after eight to 10 youths brutally beat up a 63-year-old man on a Chicago train earlier this month.