Oakwood prison: Disorder was 'full-scale riot', says officer
23 January 2014 Last updated at 09:41 GMT
A prison officer has told the BBC that what was described as a disturbance at the private Oakwood Prison earlier this month was actually a full scale riot.
A specially trained officer, who went inside the building near Wolverhampton to tackle the violence, said inmates booby-trapped doorways and shouted threats from behind a barricade.
G4S, which runs the prison, has rejected the claims.
Matt Prodger reports.