Fire broke out at a crude oil distillation unit at a refinery in the central Iranian city of Isfahan on Saturday, the official IRNA news agency reported. No one was hurt, a senior official at Isfahan governorate said, adding that the fire had been extinguished, the semi-official Mehr news agency reported. The official said pipes at the entrance of unit 3 of the refinery caught fire. He did not say what caused the pipes to catch fire.