TEHRAN (Dispatches) -- Nine people were wounded in an explosion at the Sepahan Nargostar Chemical Industries plant in the city of Shahin Shahr in Iran’s central province of Isfahan, the IRNA news agency reported Sunday. The factory is a producer of industrial and commercial explosive materials and is under the supervision of the National Security Council. In addition, the company produces various types of fireworks and gunpowder, as well as nitrate, sodium, potassium, strontium, calcium, copper and barium. The blast occurred at approximately 4:00 a.m. local time due to “unclear reasons still being investigated,” said Mansour Shisheforoush, head of the province’s crisis management organization.