A fire broke out at the Aftab oil refinery in the Iranian city of Bandar Abbas, Iranian state media reported on Thursday, adding that investigations continue on the cause of the fire.
There were contradictory reports about casualties, with several local news agencies saying one person died and three were injured.
A 38-year-old man was killed, and the three people injured were taken to hospital, where they are receiving treatment, state TV said.
One of the three is said to be in critical condition.
The facility did not sustain any major damage, semi-official Fars News Agency said.
Similar fires have been reported from time to time at the port, which is located at the mouth of the strategic Strait of Hormuz, as well as at other oil facilities in Iran.
