An Australian state has ordered a review of how radicalized prisoners are managed after a teenage inmate reportedly carved an Islamic State motto on his army veteran cell mate's forehead.

New South Wales Corrective Services Commissioner Peter Severin said on Sunday the general manager of the Kempsey prison, north of Sydney, had been suspended pending an investigation into the attack Thursday on the 40-year-old former soldier.

Severin did not detail the allegations against his 18-year-old cell mate. But newspapers reported on Sunday that he had used a sharp object to carve on the soldier's head "e 4 e" — short for "eye for an eye," a phrase from both Muslim, Christian and Jewish texts that features in Islamic State propaganda.

Severin says the former soldier "won't have any lasting injuries."