New satellite imagery indicates Iran has begun rebuilding portions of two suspected nuclear facilities damaged in U.S. and Israeli airstrikes, raising fresh questions about Tehran's willingness to comply with a cease-fire memorandum negotiated by the Trump administration.
Images obtained by CNN from commercial satellite firms show renewed construction activity at the Parchin military complex and the deeply buried Pickaxe Mountain facility, both of which were heavily targeted during the joint bombing campaign that began in late February.
At Parchin, analysts observed blast holes from the strikes being covered with mesh, concrete work underway and mixer trucks at the site by early July.
The activity represents "significant, new attempted reconstruction activity," according to David Albright, founder of the Institute for Science and International Security.
"While imagery from early June indicates damage assessment and clean-up... the newer imagery shows renewed activity at the impact holes for more permanent sealing as well as additional concrete hardening of the site," the institute said in a report released Saturday.
The report added that the work "shows a commitment by Iran to rebuild and reconstitute the capabilities previously lost, despite the immense damage at the site."
Separate imagery also showed vehicles moving in and out of the Pickaxe Mountain complex, a deeply buried facility that Western intelligence agencies suspect is connected to uranium enrichment activities.
Analysts said the activity could conflict with the U.S.-Iran memorandum requiring Tehran to "maintain the current status quo of its nuclear program" while negotiations continue.
The findings come as the Trump administration seeks to force Iran into a broader agreement permanently restricting its nuclear program.
Following months of military strikes, Washington negotiated a 14-point Memorandum of Understanding that called for a cease-fire, reopened the Strait of Hormuz and launched a 60-day negotiating period toward a final nuclear deal.
The interim agreement requires Iran to freeze its nuclear activities while the U.S. refrains from imposing new sanctions.
But the diplomatic effort has shown increasing signs of strain.
President Donald Trump declared the cease-fire effectively "over" after Iran launched attacks on commercial shipping in the Strait of Hormuz, prompting renewed U.S. airstrikes and the revocation of an oil export waiver that had been part of the interim agreement.
Technical negotiations on a permanent accord have largely stalled amid continuing military tensions.
Parchin has long been one of Iran's most closely watched military complexes.
International Atomic Energy Agency inspectors visited portions of the site in 2004 and 2005 but reported being denied access to certain areas the following year.
The complex also contains missile production facilities used to manufacture weapons deployed throughout the region.
While activity was detected at Parchin and Pickaxe Mountain, satellite imagery showed no comparable reconstruction work at Iran's major declared nuclear facilities at Natanz, Fordow and Isfahan.