About 60 people were injured at Los Llanos penitentiary, including the warden.
Hollywood women launch anti-harassment defense fund, at least 14 killed in Nigerian church shootings, immigration computers go down at US airports, and more.
Around 100 inmates were involved in a melee that saw the warden and a guard stabbed, and at least one fire set at Alabama's William C. Holman Correctional Facility.
The country’s prison authority said that 24 other inmates were also injured in the revolt that came a month after at least 16 prisoners were killed in another riot in another Guatemalan prison.
The authorities said the prison was built with the capacity for 600 inmates but currently houses over 3,000.
The report, by US-based group Human Rights Watch, found prison guards at horrifically overcrowded jails in the northeastern state of Pernambuco gave control, including the keys to their blocks, to particularly dangerous inmates.
The 2016 presidential election could determine the future of the private prison industry in the US, but its two largest corporations now take in a combined $3.2 billion in annual revenue.
Several stabbings reportedly happened in quick succession while inmates at Oklahoma's Cimaron Correctional Facility were being let out into an exercise yard.
The gruesome remains of 24-year-old Nicholas Anthony Rodriguez were found folded and stuffed into a garbage can with his abdominal and chest organs removed.
A private prison in Kingman, Arizona, remains on lockdown after two days of rioting that left separate housing units damaged and several guards injured.
The melee is the latest in a string of recent uprisings at lucrative federally contracted private prison facilities used to house undocumented immigrants.