UN inspectors visiting southern Libya found drums containing natural uranium reported missing earlier this month in the chaos-stricken country, the UN nuclear watchdog said on Saturday. The International Atomic Energy Agency said earlier this month that some 2.5 tons of natural uranium stored at a site in the southern town of Sabha had gone missing. Forces of the Libyan commander Khalifa Hifter said they found the missing material close to the storage site. In a statement to The Associated Press on Saturday, the Vienna-based agency said UN inspectors visited the area on March 21 and saw the material being transferred to the storage site. UN inspectors found that a “relatively small amount of UOC (Uranium ore concentrate) was still unaccounted for,” it said. The IAEA said, however, there was no immediate radiological risk at the location. The statement said investigations were still underway on the matter including reconciling the quantities of natural uranium at the site with those previously verified by the IAEA. The IAEA said its director-general, Rafael Mariano Grossi, informed member states Friday about the findings of the visit. Natural uranium cannot immediately be used for energy production or bomb fuel, as the enrichment process typically requires the metal to be converted into a gas, then later spun in centrifuges to reach the levels needed. But each ton of natural uranium — if obtained by a group with the technological means and resources — can be refined to 5.6 kilograms (12 pounds) of weapons-grade material over time, experts say. The material dates back to the rule of late dictator Moammar Gadhafi, who stored thousands of barrels of so-called yellowcake uranium for a once-planned uranium conversion facility that was never built in his decadeslong secret weapons program.