The video was shot by a young white woman who posted it on her Facebook account. Investigators were made aware of the video on Tuesday.
"The video is reprehensible," Chicago Police spokesman Anthony Guglielmi said.
Police said the black man lives in Crystal Lake, a northwest suburb of Chicago. It is believed he met with some people he knew in Streamwood, a neighboring suburb. The group then drove him to Chicago in a stolen vehicle.
Authorities say the victim, believed to be in his late teens or early 20s, was kept tied up, his mouth taped shut, in an apartment on the city's west side. The video shows the black man being repeatedly kicked and hit, while the white captors cut his scalp.
Police saw the victim walking on the street wearing shorts on Tuesday afternoon. When they stopped to talk with the man, they said he seemed disoriented and he was taken to the hospital and given toxicology tests to determine if he was on any substance.
It was discovered that the victim was a classmate of one of the suspects, and he was held in the apartment for at least 24 hours, possibly 48 hours.
In spite of the fact that the captors screamed obscenities about President Obama, Chicago Police Supt. Eddie Johnson said authorities don't believe the crime was politically motivated.
"I think some of it is just stupidity, people just ranting about something that they think might make a headline," Johnson said. "I don't think that at this point we have anything concrete to really point us in that direction, but we'll keep investigating and we'll let the facts guide us on how this concludes."
Oh, wait. I made a mistake. The victim in this case was actually white--it was the captors who were black. How could I have made that mistake?
Can you imagine if my satirical piece was, in fact, what actually took place? The media would go crazy. Liberals would be screaming "No justice, no peace!" in the streets. Black Lives Matter would be up in arms and marching.
But the victim was just a mentally disabled white man, so no biggie for the media and the leftist hypocrites.