Prison disturbance was 'violent hostage threat' / New policy briefs offer strategies to tackle prison violence / Prisoners allege a culture of violence by guards at federal facility in Virginia / Professor calls for national metrics to track prison violence / In numbers: Rise in prison violence laid bare in new figures / Assaults in women's prisons triple in a decade to hit record high, with more violence than men's jails / Escapee 'had enough' of prison violence / High-profile attacks on Derek Chauvin and Larry Nassar put spotlight on violence in federal prisons