International Atomic Energy Agency (IAEA) Director General Rafael Mariano Grossi said his agency does not know where nearly 900 pounds of potentially enriched uranium is located, after Iranian officials said it was being removed for protective measures ahead of strikes on nuclear facilities in Iran.

Grossi was a guest on Fox News’ “The Story with Martha MacCallum,” on Tuesday, when he was asked about the whereabouts of the enriched uranium in Iran, as well as other topics concerning the U.S. strikes on Iran’s nuclear facilities on Saturday.

The U.S. military on Saturday carried out massive precision strikes on three key nuclear sites in Iran, including Fordow, Natanz and Isfahan.

Grossi said Natanz was the first to be hit and sustained “very serious damage” in one of the centrifuge halls where enrichment was being carried out. Isfahan also sustained damage, he added, though nobody has been inside the halls to assess the damage.

FILE – This photo released on Nov. 5, 2019, by the Atomic Energy Organization of Iran shows centrifuge machines in the Natanz uranium enrichment facility in central Iran. (Atomic Energy Organization of Iran via AP, File)

Vance said in his statement that the mission was a success if Iran cannot convert the uranium to 90% for a nuclear weapon, and Grossi agreed with that statement, at least in terms of a military approach.

But Grossi’s job is different.

“My job is to try to see where is this material, because Iran has an obligation to report and account for all the material that they have, and this is going to continue to be my work,” Grossi said.