VIENNA (AP) — Iran’s Ambassador to the International Atomic Energy Agency on Monday alleged that airstrikes by the United States and Israel targeted the Natanz enrichment facility in his country.

That contradicts an assessment by the U.N. nuclear watchdog chief Rafael Grossi who said that “up to now” the agency has “no indication” that nuclear facilities have been hit in Iran.

“Again they attacked Iran’s peaceful safeguarded nuclear facilities yesterday. Their justification that Iran wants to develop nuclear weapons is simply a big lie,” Reza Najafi told reporters at the IAEA headquarters in Vienna, where a special session of the Board of Governors is being held at the request of Russia.

When asked by a reporter which nuclear facility he was referring to, Najafi replied “Natanz.”

The Natanz site, some 220 kilometers (135 miles) south of the capital, is a mix of above- and below-ground laboratories that did the majority of Iran’s uranium enrichment.

Before the war, the IAEA said Iran used advanced centrifuges there to enrich uranium up to 60% — a short, technical step from weapons-grade levels of 90%. Some of the material is presumed to have been onsite when the entire complex was attacked last June.

The main above-ground enrichment building at Natanz was known as the Pilot Fuel Enrichment Plant. Israel hit the building June 13, leaving it “functionally destroyed,” and seriously damaging underground halls holding cascades of centrifuges, the IAEA’s director-general, Rafael Grossi, said at the time. A U.S. follow-up attack on June 22 hit Natanz’s underground facilities with bunker-busting bombs, likely decimating what remained.