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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Dry for much of the Wednesday with possible brighter spells in the east. Outbreaks of rain will spread southwards later in the day.
Wednesday will be another rather cloudy and mild day. Although dry for most the odd spot of drizzle is possible, mainly over high ground.