This image posted on the Chicago Police Department’s Twitter page shows a frame from a video that was broadcast live on Facebook in which a man is assaulted. The video shows the man with his mouth taped shut as a woman and other people cut off his shirt and hair with a knife, and someone pushes his head with his or her foot. Chicago Police Superintendent Eddie Johnson said Wednesday that the victim has mental health challenges, and he called the video “sickening.” (Chicago Police Department via AP)

AP

This booking photo provided by the Chicago Police Department shows Brittany Covington of Chicago. Covington is one of four people charged Thursday, Jan. 5, 2017, with aggravated kidnapping and taking part in a hate crime after allegedly beating and taunting a man in a video broadcast live on Facebook. (Chicago Police Department via AP)

AP

This booking photo provided by the Chicago Police Department shows Tesfaye Cooper of Chicago. Cooper is one of four people charged Thursday, Jan. 5, 2017, with aggravated kidnapping and taking part in a hate crime after allegedly beating and taunting a man in a video broadcast live on Facebook. (Chicago Police Department via AP)

AP

This booking photo provided by the Chicago Police Department shows Tanishia Covington, of Chicago. Covington is one of four people charged Thursday, Jan. 5, 2017, with aggravated kidnapping and taking part in a hate crime after allegedly beating and taunting a man in a video broadcast live on Facebook. (Chicago Police Department via AP)

AP

This booking photo provided by the Chicago Police Department shows Jordan Hill, of Carpentersville, Ill. Hill is one of four people charged Thursday, Jan. 5, 2017, with aggravated kidnapping and taking part in a hate crime after allegedly beating and taunting a man in a video broadcast live on Facebook. (Chicago Police Department via AP)

AP