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Prisoners enjoy an 'impromptu rave on Christmas Day' in a video which was caused widespread outrage after emerging online.
A former officer said the video of cons dancing made him want to "vomit".
The clip is believed to have been filmed by a prisoner in HMP Lancaster Farm in North Lancashire, reports the Daily Record.
Mobile phones are not allowed in prisons.
The video has emerged on two Facebook pages so far, one of which said it happened on Christmas Day and both of which identified the same jail.
They have received more than 500,000 views with nearly 2,000 comments.
In the short clip, it shows the prisoners dancing while listening to deafening music.