The centrifuges at Iran’s Fordow uranium enrichment plant are “no longer operational,” Rafael Grossi, the head of the United Nations’ nuclear watchdog organization, said on Thursday.

The International Atomic Energy Agency, known as the IAEA, has not yet been able to access the sites since the U.S. military’s strikes almost a week ago, nor have they gotten a response from Iranian leaders to the request, Grossi told Radio France Internationale in an interview.