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
Birmingham-born veteran rocker Geezer Butler has spent a night in jail after he was arrested following a fight in a US bar.
It comes after the government announced international GCSEs, which many private schools use, would be dropped from the league tables.
The East Midlands has seen more earthquakes in the last decade than any other English region.