An explosion has occurred outside Iran's largest steel producer company near city of Esfahan, according to reports by local media.
The residents of the central city have been asked to stay indoors as poisonous gas might reach the city.
One website reported that bad odor has been spread in southern part of the city after some martial waiting to be downloaded outside Esfahan Mobarekeh Steel Company set ablaze due to the hot weather.
There is no official report on the incident and extent of casualties from the fire which has taken hours to put off. However, the unofficial reports indicate some workers have been injured in the incident.
Mobarakeh Steel Company (MSC) located 65 km south west of Esfahan, near the city of Mobarakeh is Iran's largest steel maker, and one of the largest industrial complexes operating in Iran.