Iranian news agencies reporting a loud blast and showing a flash of light at what was said to be an ammunition factory.

Emergency vehicles and fire trucks were shown at the plant in central Isfahan province. It comes amid tensions over Iran’s nuclear programme, as well as the supply of Shahed drones to Russia that have been used in the war against Ukraine.

Some reports said several facilities were hit around Iran within a period of a few hours.  Shortly Iran’s IRNA news agency reported a fire at an oil refinery in the northern city of Tabriz, saying one person was injured. It did not say what caused the fire or if it was related to the incident in Isfahan.

However, Iran’s defence ministry claimed the drone attack was “unsuccessful”, with one drone shot down by air defence and two blowing up when they were “caught in defence traps”. There was “minor damage to the workshop’s roof”.