Iran has further increased its stockpile of uranium enriched to near weapons-grade levels in defiance of international demands, a confidential report by the United Nations’ nuclear watchdog said Thursday.The report by the International Atomic Energy Agency, seen by The Associated Press, said that as of Aug. 17, Iran has 164.7 kilograms (363.1 pounds) of uranium enriched up to 60 percent. That’s an increase of 22.6 kilograms (49.8 pounds) since the IAEA’s last report in May.Uranium enriched up to 60 percent purity is just a short, technical step away from weapons-grade levels of 90 percent. By IAEA’s definition, around 42 kilograms (92.5 pounds) of uranium enriched to 60 percent is the amount at which creating one atomic weapon is theoretically possible – if the material is enriched further, to 90percent.For all the latest headlines follow our Google News channel online or via the app.The IAEA chief, Rafael Mariano Grossi, has previously warned that Tehran has enough uranium enriched to