According to Sputnik, the blast has not yet been confirmed by officials.
Fars reported that an unmanned aerial vehicle (UAV) was shot down above the Natanz facility. According to that report, the Iranian air defense systems were activated in order to defend against a target southeast of the nuclear facility.
According to an Iranian report, the explosion occurred 20 kilometers away from the facility.
Maariv quoted Iranian media as saying that the Iranian Air Force conducted an test in order to examine its response time for attacks on Natanz.
