Chicago investigators have started interrogating four African-Americans after a Facebook Live video showed that a group of people had been torturing a white mentally disabled man while someone shouted "F*** Trump!" and "F*** white people!".

Chicago police had been made aware of the video on Tuesday afternoon. A young African American woman streamed the video live on Facebook showing that more than four people were holding the young white man hostage.

Eddie Johnson, Police Supt said, “It's sickening. You know it makes you wonder what would make individuals treat somebody like that.”

Throughout the video, the victim has been kicked and hit repeatedly, his scalp has been cut. All the while he had been tied up with his mouth taped shut.

At one point, the victim has been held at knife point and told to curse President-elect Donald Trump. The group had also forced the victim to drink water from a toilet.

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Detectives believed that the victim, who lived in the suburbs and appeared to be in his late teens or early 20s, met some acquaintances in northwest suburban Streamwood and they drove him to Chicago in a stolen vehicle, according to the police spokesman Guglielmi.

The victim has been believed to have been held hostage and tortured in an apartment in the 3400 block of West Lexington on the West Side.

By Prakriti Neogi