The Israeli military said on Thursday it had targeted the Arak nuclear reactor in Iran overnight and struck what it said was a nuclear weapons development site in the area of Natanz.
Iranian media reported on Thursday morning that air defences were activated in the area of the Khondab nuclear facility, with two projectiles hitting an area close to it.
Officials told Iranian state TV that evacuations were made prior to the strikes and that no risks of radiation or casualties were detected. There was no mention of any damage.
Natanz, which Israel had previously struck during its six-day-old aerial war with Iran, was the site of a complex at the heart of Iran's nuclear programme that included two enrichment plants.
The Israeli military added that it targeted the structure of the reactor's core seal in Arak, which it identified as a key component in plutonium production.
Khondab hosts a partially-built heavy-water research reactor.
Construction was halted under a 2015 nuclear deal between Iran and world powers, and the reactor's core was removed and filled with concrete to make it unusable.
However, Iran informed the U.N.'s nuclear watchdog it planned to start operating the reactor in 2026.
Heavy-water reactors pose a nuclear proliferation risk because they can easily produce plutonium which, like enriched uranium, can be used to make the core of a bomb.
Iran says its nuclear programme, the target of Israeli strikes, is purely for peaceful purposes.
