Speaking to IRNA late on Tuesday, Arak Governor Abdolreza Haj-Alibeygi said the incident at the company in Arak, central Iran, was caused by a technical problem in the electrical system.
The official added that reports of an explosion on Line 6 of the company are untrue and dismissed claims of sabotage or any security-related incident.
He stressed that no military operation or act of sabotage has taken place at the facility.
Haj-Alibeygi also urged the public to follow news about the incident through official sources and avoid rumors and unverified announcements.
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