A power plant in the southwestern Iranian city of Ahwaz caught fire on Saturday following an explosion, the official IRNA news agency reported.

The explosion occurred at a power plant in Ahwaz’s al-Zirqan district.

The power plant caught fire due to a “transformer explosion,” IRNA reported citing Ebrahim Ghanbari, the head of the Ahwaz municipality’s fire and safety services, as saying.

“The extent of the fire is still unknown,” Ghanbari said.

Iran has been witnessing dozens of mysterious fires and explosions across the country in recent weeks.

On Thursday, Iran’s nuclear body said an accident had taken place at a construction site at the Natanz nuclear facility without causing casualties.

On Tuesday, an explosion at a medical clinic north of the capital Tehran claimed the lives of 19 people and injured over a dozen others.

On June 25, another explosion took place close to a sensitive military site near Tehran which a defense ministry spokesman told state TV was caused by a tank leak at a gas storage facility.