What is known about the start of the incident:

A reporter for the country's state television said yesterday that it was an explosion that started the fire and caused the visible smoke. The country's public broadcasting website also said the fire broke out at around 7:30 p.m. but that no deaths were to be reported at that time.

On the other hand, the official Irna agency said the burning refinery, which had been in operation since 1968, belongs to Tehran Oil Refining Company and has a capacity of 250,000 barrels per day.

 

A fire controlled but not stopped today:

This morning, the same official agency Irna quoting Chaker Khafai, spokesman of the refinery said that the fire that affected it was under control. However, around noon, a column of black smoke visible for several kilometers was still rising above the site of the fire, according to AFP journalists who said it was less thick than the day before.

Pictures of the fire and of the many fire-fighting teams at work to put it out were also broadcast this morning by state television. Finally, the authorities said the fire that broke out the day before following an explosion caused by a gas leak had caused a huge blaze and said an investigation had been opened.

 

Another accident with the sinking of a large vessel at sea :

The geographical location of the refinery is interesting as it is located a few hundred meters away from some residential areas and in a large industrial area on the edge of the Tehran metropolitan area. Although the authorities have indicated that no casualties have been reported as a result of the fire, this accident occurred just a few hours after the announcement of the sinking of one of its largest vessels in the Arabian Sea. This sinking was reportedly caused by a fire of unknown origin.

It should also be noted that industrial accidents in Iran are relatively frequent because of the tensions between the Islamic Republic of Iran and Israel and some people in the country tend to associate each of these accidents with an intervention by Israel. But others believe that US sanctions are currently making it difficult to maintain industrial infrastructure, which seems to be a more convincing explanation.