Thirty of South Australia's most hardened criminals have surrendered to police after rioting inside a jail.
The inmates were barricaded in a high-security compound of the Port Augusta jail, surrounded by tactical response police who on Friday brokered a resolution on a second day of negotiations.
A group of 39 prisoners rioted on Thursday after being refused access to an outdoor exercise yard. The group surrendered to police on Friday.
The prison officers' union says the riot was a response to chronic overcrowding of the state's jails.
Police say the prisoners made no demands during the standoff but wanted "some recognition that they think there is a problem".