Iran said it discovered and removed malicious software from two petrochemical complexes, denying that the malware had played a role in the recent fires at the plants.

The head of Iran’s civilian defense told state agency IRNA that in a “periodical inspection of petrochemical units, a type of industrial malware was detected and the necessary defensive measures were taken.”

Gholamreza Jalali said the malware was not active and did play a role in the blazes.

“The discovery of this industrial virus is not related to recent fires,” he said, according to Reuters.