The International Atomic Energy Agency blasted Iran for having "seriously undermined" efforts to inspect the country's nuclear activities in a report Tuesday.
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The report comes as the US and its allies attempt to revive the 2015 nuclear deal, with negotiations stalled in Vienna.
Iran suspended IAEA inspectors from some monitoring activities, allegedly for the US refusing to lift sanctions. This included some video and other surveillance on Tehran's nuclear program.
Iran agreed to transfer these recordings to the IAEA in an agreement that expired on June 24. Since then, the report said Iran "has failed to engage with the Agency at all on this matter for a number of months."
"Since Feb. 23 2021, the Agency's verification and monitoring activities have been seriously undermined as a result of Iran's decision to stop the implementation of its nuclear-related commitments," the report said.

The IAEA said its confidence "that it can maintain continuity of knowledge is declining over time and has now significantly further declined," which must be "immediately rectified by Iran."
Also on Wednesday, the IAEA informed senior Western diplomats that "sensitive equipment" monitoring the Iranian nuclear program was damaged in a strike that foreign media reports have attributed to Israel.
The equipment was stationed in the Towlid Abzar Boreshi complex – a large Iranian centrifuge manufacturing facility in Karaj, northwest of Tehran.
According to a Bloomberg report, the IAEA said that surveillance equipment went missing following the June incident.
The agency warned that "failure to recover its recording devices could imperil inspectors' ability to reconstruct activity at the facility in Karaj."
Iran suspended IAEA access to the site in February but allowed cameras to continue filming and said the data would be given to inspectors if its nuclear agreement with world powers is restored, the report said.
The IAEA did not name anyone as suspect in the case of the missing equipment.
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