A spokesman for CERN told Mirror.co.uk: "This video is a work of fiction. CERN fills up with visitors over summer, with users from across the world who come to CERN as part of their work, and some of whom occasionally let their sense of humour go too far.
"That is what has happened on this occasion. CERN does not condone this kind of spoof."
The woman the seems to lie down on the ground before a man in a cloak approaches her with his hands raised above his head.
Viewers of the footage speculate the man is holding a knife which he appears to plunge into the woman's chest before the clip suddenly cuts off.
http://www.mirror.co.uk/news/weird-news ... eo-8655022