Calm has been restored at Cessnock Gaol after a riot broke out.
A group of inmates at the Shortland H-Block began locking themselves in rooms and lighting fires on the roof at about 11.15am on Thursday.
They were demanding opioid substitution therapy to deal with drug withdrawals caused by the loss of supply of illicit drugs, after personal visits were suspended during the COVID-19 pandemic.
Corrective Services says officers were eventually able to secure the inmates back to their cells.
No staff or inmates were injured.
