Chicago police

Facebook Live 'sex assault': Boy, 14, arrested in Chicago

The boy faces charges of aggravated criminal assault and manufacturing and disseminating child pornography. He was not named because of his age.

The girl was allegedly assaulted by five or six males last month.

Around 40 people were said to have been watching the stream at one point but nobody reported the incident to police.

A teenager had alerted a relative of the girl's, Reginald King, to the assault.

"There were adults who saw this. None of them had the wherewithal to say, 'Hey, I gotta call someone'," Mr King said.

Chicago police hold four over live-streamed attack

The man being assaulted has special needs, police say. His assailants can be heard making derogatory statements against white people and President-elect Donald Trump.

In one part of the video they use a knife to remove part of his scalp.

Chicago police have described the video as a "sickening" possible hate crime.