Criminal charges have been laid against 21 men over a prison riot in Darwin in May that required more than 100 corrections officers plus police to control.
The prisoners broke out of their medium security cells at the Darwin Correctional Centre on the night of May 13, armed themselves and set fire to parts of the jail including the chapel, the sacred sorry business building, security offices and control rooms.
Some estimates put the damage bill at $40 million.
About 90 off-duty staff were called to the prison to back up the 16 that were working while police, firefighters and an ambulance also attended.
The 21 men were aged between 18 and 43 but mostly in their 20s and include a convicted murderer.
They eventually agreed to come down from the roofs after negotiations and were back in their cells by 1.30am Thursday, nearly five hours after the incident started.
They were moved into the high security unit following the riot but there have been further disturbances since.
"During the riot, a significant amount of damage was caused to a number of buildings including accommodation and educational buildings," Detective Acting Senior Sergeant Jak Evans said on Tuesday.
"This behaviour is unacceptable, this should serve as a reminder that those doing the wrong thing will be held accountable for their actions."
Two prisoners suffered what were described as minor injuries.
All 21 of the men face damage property in a riot and escape lawful confinement charges, with 10 also charged with arson, three with assault a worker and one with a threat to burn or explode and all will face court in July,
Jefferson Bradshaw, 25, was due to be released last weekend but was one of the men charged with assaulting a worker and has been remanded in custody.
Attorney General Natasha Fyles announced an independent review into the riot by John Paget, an associate professor at Charles Sturt University, while inquiries are also being conducted by police and NT Correctional Services.
The COVID-19 pandemic has caused delays and upheaval in the Territory justice system, with jury trials suspended until recently, court matters held via video link, social visits to prisoners and prisoner work party camps in the community temporarily suspended .