The latest UN report on Iran's nuclear program should pave the way for passage next week of a new UN Security Council resolution tightening sanctions on Tehran, the US. ambassador to the UN said Friday. The report released Friday by the Vienna-based International Atomic Energy Agency confirmed that Iran has continued to enrich uranium in defiance of repeated UN Security Council resolutions demanding that it suspend the uranium centrifuge program, which could produce both civilian nuclear fuel and the material for a nuclear bomb. Tehran insists it is interested only in civilian nuclear energy, but the US and others contend it harbors ambitions for a bomb. "They're increasing their capabilities," US Ambassador Zalmay Khalilzad noted. "Not only have the number of centrifuges increased, but they're working on a second-generation, if you like, a more capable centrifuge.