"Isfahan we targeted in the first 24 hours of our operation, but we carried out a second wave of strikes there overnight, deepening our achievements and advancing the damage to the facility," the military official told reporters during a briefing on condition of anonymity.

He added that the targeting of two centrifuge production sites in Isfahan was "in addition to a couple more centrifuge production sites that we have been able to strike successfully in recent days".

The repeated raids by the Israeli air force have "dealt a severe blow to Iran's centrifuge production capabilities," the official added.

Centrifuges are used to enrich uranium, both for civilian and military use, with the radioactive metal needing to be enriched to high levels for use in atomic weapons.

Isfahan, in central Iran, is known to have a uranium conversion facility which processes raw, mined uranium.

It also holds a nuclear fuel fabrication facility, which was inaugurated in 2009 and produces low-enriched fuel for use in power plants.

In July 2022, Iran announced plans to construct a new research reactor there.

On the first day of Israel's strikes on June 13, the Israeli military said it had struck "a facility for producing metallic uranium, infrastructure for reconverting enriched uranium, laboratories, and additional infrastructure" in Isfahan.

Iran's atomic energy agency said afterwards that the damage was "not extensive" and there was no cause for concern about radiation.

Israel has also targeted Iran's two main underground nuclear sites, Natanz and Fordo.