\"If you're dumb enough to post a crime on social media then that shows were your head is,\" Johnson said.

The footage, obtained by ABC station WLS-TV in Chicago, shows the victim standing against what appeared to be an outdoor utility box and being surrounded by at least five young people who punched her repeatedly in the head and back as she defensively turned her back to the attackers before she fell to the ground. The person who apparently recorded the video is heard laughing as the victim screamed for help.

\"This is beyond disturbing to watch and this young girl deserves better,\" Anthony Guglielmi, spokesman for the Chicago Police Department, wrote in a Twitter post on Thursday.

Valdez said the victim was found on Wednesday aboard a Chicago Transportation Authority train when a citizen recognized her from the video.

The victim, whose name was not released, was taken to a police station and then to Comer Children’s Hospital Chicago, where she was treated for undisclosed injuries and released.

\"In their interviews, the detectives learned that the victim met several juveniles who she thought were her friends. These girls then taught her how to flash gang signs and as this was occurring a beating began which was captured on video,\" Valdez said.

He said the investigation is ongoing and did not rule out the possibility of more arrests.

Valdez declined to comment on the extent of her injuries.

Asked if the victim was sexually assaulted, Johnson said, \"In terms of a sexual aspect, we're not prepared to talk about that at this time.

Police also did not specify a motive for the attack, but Johnson said, \"There were some things going on that these young ladies wanted her to do that she didn't do. We'll leave it at that for right now.\"

Johnson thanked the community for providing tips that helped investigators locate the victim and arrest the suspects, who appeared Thursday in juvenile court.

\"Some of the parents of the offenders and the offenders themselves also did the right thing and brought information and individuals forward to the police,\" Johnson said.

He added that he hopes the alleged incident becomes a \"teaching moment\" for the young girls charged in the attack, saying, \"hate, bullying, and bigotry are cancers on our society that do nothing but break and divide us.\"

He called the attack an \"affront to who we are as Chicagoans.\"

\"It stands in direct conflict to the 'City of Broad Shoulders,'\" Johnson said. \"We all have to work together to help ensure that this type of behavior is rooted out of our communities and our city.\"

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