Security firm, G4S, has confirmed that there is an 'ongoing incident' on a wing at Oakwood Prison.
“The situation is contained and we are applying standard procedures to manage the incident.
“It would be inappropriate to comment further at this stage."
No further information was available about what had triggered the problem.
It follows a number of rooftop protests last year.
In July 2013, HMP Oakwood, in Featherstone near Wolverhampton, was one of three prisons in England and Wales to be rated 'of serious concern' by the Ministry of Justice.
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