A judge on Monday continued a hearing for a 14-year-old boy arrested and charged in the sexual assault of a 15-year-old girl that was streamed last month on Facebook Live.
The teen's case was brought before a judge in juvenile court where a status hearing was continued. The teen did not appear before the judge Monday and will remain in custody until the next court appearance, scheduled for April 28.
The 14-year-old faces charges of aggravated criminal assault, manufacturing of child porn and dissemination of child porn.
A warrant has also been issued for a 15-year-old in the case, and detectives are working to identify "several other offenders" in what Chicago's police chief called an "absolutely horrific" assault.
Police have said about 40 people viewed the attack on Facebook while it was happening, but none of them reported it to police.
"The young men responsible, they should be ashamed of themselves," Johnson said. "They humiliated themselves, humiliated their families, and now they're going to be held accountable for what they did."
Police said social media search warrants, obtained by working with Facebook, led detectives to identify two offenders and secure arrest warrants.
A day after the March 19 attack, the victim's mother received still shots of her daughter being sexually assaulted, police said.
The woman then reported her daughter missing, and on March 21 she approached Johnson as he was leaving a police station in the Lawndale neighborhood.
"Not only was she upset, I was visibly upset from what I saw," Johnson said.
Since the assault, the victim has been bullied online, police said.
She has since been moved from her home to a "safe place," community activist Andrew Holmes said. She and her mother are receiving counseling.
"As a father of young women myself, I am so inspired by her strength," Johnson said, "and while I know the emotional wounds caused by this savagery will take long to heal, I'm hopeful that her story can be an inspiration to so many other young women who are victimized by bullying and sexual assault,"
The investigation is ongoing, Johnson said.