Analysis: Iran likely transferred highly enriched uranium to Isfahan before the June strikes

Image: NASA FIRMS imagery 2025-06-19 of the Isfahan Nuclear Research Center. Image source: Imagery from LANCE FIRMS operated by NASA’s Earth Science Data and Information System (ESDIS) with funding provided by NASA Headquarters via Wikimedia Commons. Public Domain. Article by François Diaz-Maurin. Bulletin of the Atomic Scientists – March 29, 2026.

Working with a team of visual investigators that included the Bulletin, the French newspaper Le Monde has analyzed a previously unreported satellite image of the Iranian nuclear site at Isfahan, showing a large truck loaded with containers. In a Le Monde article published Saturday, experts said they could not be certain what the containers held. But the timing of the image, the type of load, and other indirect evidence suggest that Iran may have placed a significant quantity of highly enriched uranium—possibly all of its inventory—at the facility ahead of the June 2025 strikes by Israel and the United States against Iranian nuclear sites. […]

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