Iran fortifies uranium cache, raising risks for any U.S. seizure plan

Iran has dramatically intensified fortifications around a roughly half-ton cache of near bomb-grade uranium, collapsing tunnels and placing mines at entrances to make retrieval far riskier and slower. The moves complicate any U.S. plan to seize the material amid ongoing negotiations to remove and destroy the stockpile, with extraction requiring heavy equipment and de-mining and with conflicting accounts about the draft deal terms.