CHICAGO (AP) — Four black people were charged with hate crimes Thursday in connection with a video broadcast live on Facebook that showed a mentally disabled white man being beaten and taunted, threatened with a knife and forced to drink from a toilet.The assault went on for hours, until Chicago police found the disoriented victim walking along a street, authorities said.The suspects, who were jailed, can be heard on the video using profanities against white people and President-elect Donald Trump.Police spokesman Anthony Guglielmi said investigators initially concluded that the 18-year-old man was singled out because he has “special needs,” not because he was white, although Guglielmi acknowledged the suspects made “terrible racist statements.”It’s also possible that the suspects were trying to extort something from the victim’s family, Guglielmi said.In addition to hate crimes, the four were charged with kidnapping, aggravated battery and aggravated unlawful restraint. Three were also charged with burglary.The victim was a classmate of one of the attackers and initially went with that person voluntarily, police said.“He’s traumatized by the incident, and it’s very tough to communicate with him at this point,” police Cmdr. Kevin Duffin said.Excerpts of the video posted by Chicago media outlets show the victim with his mouth taped shut and slumped in a corner of a room. At least two assailants cut off his sweatshirt, and others taunt him off camera. The video shows a wound on the top of the man’s head, and one person pushes the man’s head with his or her foot.A red band also appears to be around the victim’s hands. Authorities said he was tied up for four to five hours.Off-camera, people can be heard using the profanities. At least one woman is seen in the footage.During the video, the victim does not appear to make any attempt to defend himself or to escape his attackers. He is a suburban Chicago resident described by Police Superintendent Eddie Johnson as having “mental health challenges.”Johnson said the video was “sickening.”“It makes you wonder what would make individuals treat somebody like that,” he said Wednesday.The incident began Dec. 31, when the victim and one of the suspects, 18-year-old Jordan Hill, met at a suburban McDonald’s to begin what both the victim and his parents believed would be a sleepover, police said.Instead, Hill drove the victim around in a stolen van for a couple of days, ending up at a home in Chicago, where two of the other suspects lived, Detective Commander Kevin Duffin said.The victim told police what began as playful fighting escalated, and he was bound, beaten and taunted with racial slurs and disparaging comments about his mental capacity.A downstairs neighbor who heard noises threatened to call police. When two of the suspects left and kicked down the neighbor’s door, the victim escaped. A police officer later spotted the obviously disoriented man wandering down a street.The grandmother of a young woman associated with the video said the granddaughter she raised from infancy is “not this person.”“I’m so upset, my head is about to bust open,” said Priscilla Covington of Chicago. “I don’t know if someone influenced her … She had her ups and down. (She) was a good person. I’m so confused.”In Washington, White House press secretary Josh Earnest said the beating demonstrated “a level of depravity that is an outrage to a lot of Americans.”He said he had not yet spoken to President Barack Obama about the attack in the president’s hometown.Cook County prosecutors identified the suspects as Brittany Covington and Tesfaye Cooper, both of Chicago, and Hill of suburban Carpentersville. All are 18. A fourth suspect was identified as 24-year-old Tanishia Covington, also of Chicago.The video emerged at a time when police dealings with Chicago’s black community are being closely watched. Less than a year ago, the nation’s third-largest police force was sharply criticized by a task force for using excessive force and honoring a code of silence.The department has also been the subject of a long civil-rights investigation by the Justice Department, which is expected to report its findings soon.