Updated

Chicago police say they are investigating a video circulating on social media that shows several people beating a man at a residence.

Police Superintendent Eddie Johnson said at a news conference Wednesday that four suspects are in custody. Formal charges have not been filed.

Johnson says the victim, who has "mental health challenges," is recovering.

Johnson calls the video "sickening," and Police Cmdr. Kevin Duffin says the suspects made "stupid decisions."

Officers were called to a residence on the city's West Side Tuesday evening where they found signs of a struggle and damaged property.

Videos of the alleged incident were posted on social media. Police say it is too soon to make a determination if the attack was racially motivated.