Prisoners broke windows and set fires during a botched escaped attempt that left at least nine prisoners dead and 33 injured, Iran's State TV said Wednesday.
The prisoners clashed with security forces Tuesday night at Ghezel Hesar Prison, 30 kilometers (18.64 miles) west of capital, Tehran.
State TV said none of the prisoners managed to escape. According to the report, most of the prisoners involved were convicted drug smugglers on death row.
The website for the state prisons system said the inmates attacked the guards, who fought back.