Corrections Minister Anne Tolley has denied tension levels are rising within prisons throughout the country.
The minister and her department were before the Law and Order Select Committee on Wednesday to explain a riot involving 29 inmates at Spring Hill prison on 1 June.
It ran for 10 hours and caused more than $1 million in damage.
Mrs Tolley warned MPs against speculating on the causes of the riot.
She has previously blamed gang tensions, but on Wednesday she said the cause could ultimately be determined as something quite insignificant.
She said there are always prison tensions between gangs, for example, but she denies that tensions are rising as a general rule.