A 15-year-old girl was allegedly sexually assaulted by five or six men or boys as around 40 people watched on video streaming service Facebook Live without reporting the attack.

The mother of a 15-year-old Chicago girl said on Wednesday that she no longer feels safe in her neighborhood after receiving online threats. Officers were only made aware of the attack when the teenager’s mother told Superintendent Eddie Johnson that her daughter was missing.

“It’s disgusting. It’s so disgusting,” the girl’s mother said, describing the apparent assault in an interview, before the girl was found. “I didn’t really want to look at it that much, but from what I saw, they were pouring stuff on her, and just… she was so scared.”

The victim went missing on Sunday in the crime-plagued city in the US Midwest. She was found on Tuesday and taken to a children’s hospital for treatment. The live online video of the alleged gang rape attracted as many as 40 viewers at one time, but no one contacted police, according to reports. The video was later taken down.

Police found her daughter on Tuesday, but the girl’s mother said that she and her daughter are afraid to stay at their home because of Facebook threats they’ve received and neighborhood children taunting their family.

“[The Chicago Police Dept.] is aware of the social media communication and visits to the family’s home and detectives have filed case reports and opened parallel investigations in reference,” police spokesman Anthony Gugleilmi said in a statement on Wednesday.

Chicago Police are searching for as many as six people involved in the sexual assault of a teenage girl that was broadcast on Facebook Live. Some people are identifiable from the video, Guglielmi said. The teen knew at least one of her alleged attackers and may have been acquainted with the others.

According to its community standards, Facebook removes content, disables accounts and works with law enforcement in cases of genuine risk of physical harm or direct threats to public safety. If a live stream starts blowing up, staffers monitor it for possible violations and interrupt it if need be.