Iran has escalated efforts to seal off its cache of near bomb-grade uranium, collapsing tunnels and planting explosive mines at entrances, according to five sources familiar with US intelligence.
The fortifications make retrieval far more difficult and dangerous, complicating Trump administration negotiations for a deal to remove the material.
Even Iran itself would now need heavy excavation equipment and de-mining efforts to access the roughly half-ton stockpile.
AI-generated summary was reviewed by a CNN editor.
In recent weeks, Iran has dramatically escalated efforts to seal off its cache of near bomb-grade uranium, deliberately collapsing tunnels and booby-trapping entrances with explosive mines, according to five sources familiar with US intelligence.
