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The harrowing clip sees the man, whose face is obscured, talking to the camera before saying “I’ve murdered them”.

In a dialogue littered with swearing, he adds: “I never wanted to be a murderer. It wasn’t supposed to be like this.”

The video is shot in what appears to be an abandoned building and looks to be somewhere in Britain.

(Image: YOUTUBE/SEVENTYBROAD)

But the exact location is unknown, meaning it is unclear which police constabulary would be responsible and whether any are investigating the footage.

Its authenticity is also unclear, but it would surely be one of the most sickening clips in the worst taste should the video prove to be a prank.

The video was uploaded by a user called seventy broad, whose YouTube channel shows other clips filmed in the derelict building - but none offer clues as to where it is.

In one frightening piece of footage the man appears to douse himself in a liquid and try to set himself alight, without success.

That video was posted a week after the confession, which was published on September 27 but was recently posted on Reddit.

Accompanying the video, the user wrote: “I’m so f****** sorry for what I've done to my friends and family I hope you can forgive me I didn’t mean for it to happen like this I didn’t mean to be a killer I’m so f****** sorry I just want to go home.”

(Image: YOUTUBE/SEVENTYBROAD)

It comes as another video sparked a police investigation over a missing teenage girl in the US.

Kayla Berg went missing in 2009 and her mum believed her daughter may be alive after she saw a clip online of man who had a girl who she thought looked and sounded like Kayla - locked up in a cupboard.

But it transpired the footage was from a comedy skit published in 2009 and was not connected to the girl’s disappearance.

Daily Star Online contacted the Metropolitan Police in regards to the footage and also reported it to YouTube.