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
A member of public alerted the police after discovering the body.
West Midlands Police was among those who sent firearms teams to assist Greater Manchester Police last night.
He was convicted of 31 sexual offences against 18 children.