evidence: VIENNA (AP) — Iran has further increased its stockpile of uranium enriched to near weapons-grade levels, according to a confidential report on Monday by the United Nations’ nuclear watchdog, the latest in Tehran’s attempts to steadily exert pressure on the international community. [...] The report, seen by The Associated Press, said that as of May 11, Iran has 142.1 kilograms (313.2 pounds) of uranium enriched up to 60% — an increase of 20.6 kilograms (45.4 pounds) since the last report by the U.N. watchdog in February. Uranium enriched at 60% purity is just a short, technical step away from weapons-grade levels of 90%. [...] Also as of May 11, the report says Iran’s overall stockpile of enriched uranium stands at 6,201.3 kilograms (1,3671.5 pounds), which represents an increase of 675.8 kilograms (1,489.8 pounds) since the IAEA’s previous report.