Josefine Lundgren, 21, was one of the witnesses who watched the incident online and reported it.She said she saw the victim being stripped and then sexually assaulted by several armed men and said the attack only ended several hours later when police arrived and switched off the webcam.
In June last year gang member Antonio Perkins, 28, unwittingly live streamed his own death on Facebook after he was shot dead in Chicago while using the real time video app.
Last month Swedish police arrested three men on suspicion of gang-raping a woman live on Facebook to a closed group with 60,000 members.
The film has been removed from Facebook but after it circulated on the internet.
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