Bosses at security firm G4S, which runs HMP Oakwood in South Staffordshire, have put contingency plans in force as a rooftop protest continues at the prison.
A spokesman confirmed six prisoners were involved in the incident.
We can confirm that an incident involving six 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
Part of the bridge wall and footpath in Barrow-upon-Soar in Leicestershire fell onto the tracks last summer.
His family are extremely worried as they say this is really out of character for Aaron who has never been missing before.
Very mild but often cloudy and damp.