The report did not elaborate how Karimi would have gotten access to one of the most secure facilities in the Islamic Republic.
The announcement seemed to add a new obstacle to multilateral negotiations underway in Vienna aimed at restoring the 2015 nuclear deal between Iran and six world powers.
"Therefore, the concerns raised by the U.S. and Europe. and the perception that the 60% enrichment means moving towards 90%, is not true; It is wrong to think that we are paving the way for the production of atomic bombs", Rouhani said Thursday.
It added that "a large number" of centrifuges whose enrichment activity was disrupted by the explosion had been returned to normal service, the report said.
The burning issue is that the USA should come up with a concrete plan to lift sanctions, and based on this, Iran should comprehensively resume the implementation of the JCPOA, Wang Qun, Chinese envoy to the United Nations and other worldwide organizations in Vienna, said at a meeting of the Joint Commission of the JCPOA in the Austrian capital.
State TV also aired footage of rows of what it said were centrifuges which had replaced the ones damaged in the blast on 11 April at the Natanz uranium enrichment plant, Reuters reported.
Iran has said it is not seeking to build a nuclear weapon, and a US intelligence report released earlier this week determined that Tehran was not "currently undertaking" activities needed to produce such a weapon. "Many of the centrifuge chains that faced defects are now under control".
Washington wants Iran to reverse the breaches of the deal that it made in retaliation for tough sanctions imposed by former President Donald Trump after he pulled the USA out of the deal in 2018.
Though 60% enrichment of the chemical element is is a record high for Iran, it is still below the 90% threshold required for nuclear weapons.
"Iran's "seriousness of purpose" in pursuing diplomacy was tested in the three years since Trump withdrew from the nuclear accord".
Wang called on all parties to the deal to remove all disturbances and speed up the negotiation process to hash out an arrangement for the US and Iran to resume compliance with it. However, the Islamic Republic now has no such ships in its navy.