The International Atomic Energy Agency concluded on Sunday that an explosion at the Natanz uranium enrichment facility in central Iran was an "act of sabotage."
The Natanz uranium-enrichment site, much of which is underground, is one of several Iranian facilities monitored by the IAEA.
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The UN atomic watchdog made the claim after international inspectors conducted an investigation following a visit to the site earlier this week.
On July 2, an explosion decimated a warehouse under construction at the nuclear complex but caused no casualties or radioactive pollution, according to Iran's nuclear body.
A spokesman for the Iranian Atomic Energy Organization has acknowledged that the incident caused "significant damage" and that the building had been designed to produce "advanced centrifuges."
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Iranian officials have openly blamed Israel for the incident, but have never presented evidence pointing at Jerusalem's involvement in the explosion.
Iran restarted enriching uranium at Natanz last September, despite having agreed under the accord to put such activities there on hold.
i24NEWS contributed to this report.
