In this image made from April 17, 2021, video released by the Islamic Republic Iran Broadcasting, IRIB, state-run TV, various centrifuge machines line the hall damaged on Sunday, April 11, 2021, at the Natanz Uranium Enrichment Facility, some 200 miles (322 km) south of the capital Tehran, Iran. Iran named a suspect Saturday in the attack on its Natanz nuclear facility that damaged centrifuges there, as Reza Karimi and said he had fled the country "hours before" the sabotage happened. (IRIB via AP, File)
Iran has denied inspectors access to crucial sites and has refused to explain the presence of highly enriched, man-made uranium particles at three locations. AP

Iran increases uranium enrichment amid freeze in nuclear talks