An explosion and fire were reported at a petrochemical plant in the Qom Province of Iran on Sunday, local media reported.
Some 150 firefighters and 20 firefighting vehicles worked to stop the large fire, according to the reports.
At least Two firefighters were seriously injured and two of the fire trucks were destroyed while battling the flames.
The source of the explosion remained unknown.
Last year, a series of explosions and fires hit industrial sites across Iran, including a number of petrochemical plants. Iranian officials referred to most of the cases as incidents or accidents.
However, some reports have claimed that at least some of the incidents involved sabotage.