Four Chicago youths have been arrested after they bound and tortured a mentally challenged white male all while broadcasting the horrific event live on Facebook.

The suspects, who are all black, can be heard shouting “F*** Donald Trump” and “F*** white people” as they tormented the victim during the demented 30 minute video. At one point, the teens, who were smoking blunts, are seen cutting the victim’s hair until his scalp bled.

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The victim is an 18-year-old from a Chicago suburb. Police say he is mentally challenged, and had been reported missing. He was found disoriented Tuesday, and cops later connected him to the disturbing social media clip … which led them to the suspects. h/t tmz

Chicago police have described the video as a “sickening” possible hate crime.

“It makes you wonder what would make individuals treat somebody like that,” Chicago Police Superintendent Eddie Johnson said in a press conference streamed on Twitter.

“I’ve been a cop for 28 years, and I’ve seen things that you shouldn’t see in a lifetime, but it still amazes me how you still see things that you just shouldn’t.”