The company running Oakwood Prison in Wolverhampton, G4S, has confirmed that "an incident" is taking place at the prison, involving three prisoners.
Earlier reports have suggested the prisoners are protesting on the roof of the much-criticised prison.
We can confirm that an incident involving three prisoners is taking place at HMP Oakwood.
The Ministry of Justice has been alerted and our normal contingency plans have been enacted.
More top news
Officers are investigating after a piece of tree was dropped from the Birchfield Road overpass onto the A448.
The plans would see Belgrave Gate/Haymarket and Church Gate transformed.
Tributes pour in for Wolves legend and cricket trailblazer Baroness Rachael Heyhoe Flint.