The United Nations' International Atomic Energy Agency announced today, Sunday, that Iran had prevented it from entering a workshop for the manufacture of centrifuge components near Tehran.

The agency was denied access to a workshop for the manufacture of centrifuge components in Karaj, near Tehran, contrary to what was stated in the September 12 agreement with Iran, the UN said in a statement.

"All of the agency's activities mentioned in the joint declaration, on all equipment, all facilities and all Iranian sites, are necessary to maintain the continuity of its oversight mission," the statement added.

The Director-General of the International Atomic Energy Agency, Rafael Grossi, told member states in his latest report on Iran that it had allowed all other access between September 20 and 22.

The report comes as negotiations stalled on reviving the 2015 nuclear agreement, which stipulates restricting Iran's nuclear program in return for easing sanctions imposed on Tehran.

But after the unilateral US withdrawal from the agreement in 2018 under former President Donald Trump, Iran has gradually abandoned most of its commitments.

Iranian Foreign Minister Hossein Abdullahian said on Friday that talks to revive the deal would resume "very soon", but the United States was skeptical of Tehran's intentions.

The aim of the talks is to bring the United States back into the deal in exchange for Iran resuming reducing its nuclear activities and allowing the International Atomic Energy Agency to fully exercise its oversight role.