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CHICAGO – A young woman who broadcast the beating of an 18-year-old man on Facebook Live has been arrested with three others in connection with the gruesome attack, Chicago Police said Wednesday.

The disturbing 30-minute video shows a man tied up and his mouth covered, cowering in the corner of room. His attackers laugh and shout "f*ck Donald Trump" and "f*ck white people" as they kick and punch him and and cut into his forehead with a knife.

Chicago Police Superintendent Eddie Johnson said the video, which police believe to be credible, shows a "brutal act toward an adult male with mental health challenges."

Police say officers observed a disoriented male in "distress" walking in the 3400 block of West Lexington Wednesday around 5:30 p.m. After speaking to the victim, the officers then responded to a home nearby. There, they discovered “signs of a struggle and damage to property.” Police say the officers connected this evidence to the disoriented male.

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The victim was taken to the hospital and is in stable condition.

“Officers later became aware of a social media video depicting a battery of an adult male which is believed to be the same individual,” police said in a statement.

The suspects, two men and two women, all 18, are in custody awaiting formal charges. Three of those people are from Chicago and one is from Carpentersville, according to police. The victim apparently knew one of them.

Police in Streamwood say the victim's parents dropped him off at a McDonald's there on New Year's Eve. His parents reported him missing after they didn't hear from him again.

Police also say the suspects stole a van in the suburbs and transported the victim into the city.

The investigation is ongoing. Authorities are still determining whether it should be considered a hate crime.

Regarding the disturbing video that surfaced on social media of a battery: Incident is under investigation/suspects are being questioned pic.twitter.com/GGi3qs9rGv — Chicago Police (@Chicago_Police) January 4, 2017

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