A Defense Ministry spokesman said a gas explosion near the Parchin complex had caused no injuries. But the base is also a major military development site.
Satellite photographs show the explosion happened at a missile production facility. Iran said the episode was a gas explosion at a different military base.
Die Serie von Explosionen in strategisch sensiblen Einrichtungen reißt nicht ab. Zwar sind Hintergründe und Ursachen noch nicht eindeutig geklärt. Doch für den Iran steht vor allem ein Land unter Verdacht: Israel.
The incident is under investigation, according to Iran state media, Press TV, which cited an anonymous Iranian security official as saying that there was "no evidence" of sabotage.