Satellite images show renewed activity at the Minzadehei compound northeast of Tehran, a site Israeli officials have linked to nuclear weapons development and Israel struck in March 2026. The Institute for Science and International Security said the activity could point to an effort by Iran to reestablish nuclear weapons development capability and restore what the attack destroyed. The images document movement and construction work. They don't establish what specific work is underway.
Activity at Minzadehei
The institute’s report, published Tuesday, examined high-resolution images Vantor Technologies took in September and October. It described regular vehicle activity returning alongside continuing earth-moving work. Cars sat outside the compound’s security perimeter, while passenger vehicles and trucks appeared inside it between early September and early October.
At an area struck in March, images show earth-moving work on a surface that appeared to be a courtyard. Multiple craters marked the area after the strike. Elsewhere, the images show significant vehicle activity. The institute said that pattern could indicate “an effort by Iran to reestablish a nuclear weapons development capability and to reconstitute what was lost in the attack on the compound.”
The Jerusalem Post reported that satellite images taken on Thursday showed extensive cleanup and renewed activity after the March strikes destroyed several buildings and likely underground structures. The IDF identified the compound as Minzadehei, on Tehran’s northeastern outskirts, and said it destroyed the site on March 3, 2026. Seven months have elapsed since the strike, according to the supplied date reference.
Israeli assessment of the site
In March, IDF Chief Spokesman Brig.-Gen. Effie Defrin said the site was linked to Iran’s nuclear weapons development efforts. The IDF said intelligence had tracked Iranian nuclear scientists traveling to the compound before the strike. It described the facility as designed to restore technology and advance capabilities needed to develop nuclear weapons.
The IDF didn't identify the specific component being developed there. The compound included aboveground buildings and structures built into the surrounding hillside. The Institute for Science and International Security described it as highly secured, with buildings, roads and structures partly embedded in the hillside. The reported presence of scientists, combined with the latest vehicle and earth-moving activity, frames the security concern raised by the renewed work. Still, the available reporting doesn't specify what the activity means beyond the institute’s assessment.
Other reported nuclear-site activity
Renewed activity at Minzadehei comes alongside separate reports about possible rebuilding elsewhere in Iran’s nuclear programme. In September, Israeli intelligence presented information indicating new construction at Pickaxe Mountain, a mountainous site south of Tehran identified as a possible location for restoring parts of the programme.
The reporting didn't establish that uranium enrichment was taking place at Pickaxe Mountain. A satellite-view caption identified vehicles at an entrance to tunnels near Iran’s Natanz nuclear facility on June 21; Vantor provided the image via Reuters. The caption doesn't establish that the vehicles or tunnels were connected to enrichment activity.
The institute’s imagery and the IDF’s account identify Minzadehei as a site of concern, but leave the specific component and purpose of the current work unconfirmed. The images show activity has resumed at the compound after Israel’s strike. They don't, by themselves, confirm that Iran has reconstituted a nuclear weapons development capability.