Officials from CERN, an organization hosting the largest particles physics laboratory in the world, are looking for those involved in a rather disturbing video aiming to show a fake ritual human sacrifice on campus.

The footage shot at night in front of a Shiva statue on the premises of the European Organisation for Nuclear Research (CERN) campus in Geneva shows people in black cloaks and a woman in a white dress who was stabbed with a shiny metallic object which looked like a knife.

“These scenes were filmed on our premises but without official permission or knowledge,” the CERN spokeswoman also said, according to AFP.

The video was purportedly shot from a restricted access office building by a viewer who seemed to have noticed the incident by chance. However, at some point the reflection on the window reveals that the witness appears to wear the same attire as the men outside.

WARNING: DISTURBING FOOTAGE, EXPLICIT LANGUAGE

The clip has also cast doubt on the levels of security at the center.

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“CERN IDs are checked systematically at each entry to the CERN site whether it is night or day,” the spokeswoman said, adding that those on the footage had access badges.

The video, titled “Murder at Cern…” was made public on YouTube and Facebook on Stranger Than Fiction News channel on August 11 raising concerns online.

Officials are currently searching for people standing behind the incident what has been called by CERN spokeswoman a prank.

“CERN welcomes every year thousands of scientific users from all over the world and sometimes some of them let their humor go too far. This is what happened on this occasion,” the CERN official said.

“CERN doesn’t forgive this kind of parodies that go against the center’s professional principles and the investigation is currently underway,” the press-service added.

Geneva police have been notified about what happened on CERN’s campus, however, are not involved into the investigation, AFP reported.