Iran is close to clinching a deal to clandestinely import 1,350 tons of purified uranium ore from Kazakhstan, according to an intelligence report obtained by The Associated Press on Tuesday. Diplomats said the assessment was heightening international concern about Teheran's nuclear activities. Such a purified uranium ore deal would be significant because Teheran appears to be running out of the material, which it needs to feed its uranium enrichment program. The report was drawn up by a member nation of the International Atomic Energy agency and provided to the AP on condition of that the country not be identified because of the confidential nature of the information. Such imports are banned by the UN Security Council. In New York, Burkina Faso's UN Ambassador Michel Kafando, a co-chair of the Security Council's Iran sanctions committee, referred questions Tuesday about a potential deal between Iran and Kazakhstan to his sanctions adviser, Zongo Saidou. Saidou told the AP that, as far as he knew, none of the UN's member nations have alerted the committee about any such allegations. "We don't have any official information yet regarding this kind of exchange between the two countries," Saidou said. "I don't have any information; I don't have any proof." A senior UN official said the agency was aware of the intelligence report's assessment but could not yet draw conclusions. He demanded anonymity for discussing confidential information. A Western diplomat from a member of the IAEA's 35-nation board said the report was causing "concern" among countries that have seen it and generating "intelligence chatter." The diplomat also requested anonymity for discussing intelligence information. A two-page summary of the report obtained by the AP said deal could be completed within weeks. It said Teheran was willing to pay $450 million, or close to 315 million euros, for the shipment. The price is high because of the secret nature of the deal and due to Iran's commitment to keep secret the elements supplying the material," said the summary. An official of the country that drew up the report said "elements" referred to state employees acting on their own without approval of the Kazakh government. After-hours calls put in to offices of Kazatomprom, the Kazak state uranium company, in Kazakhstan and Moscow, were not answered Tuesday. Iranian nuclear officials also did not pick up their telephones. Separately a senior US official who demanded anonymity for talking about confidential information said Washington was aware of the intelligence report, but declined to discuss specifics. "We are not going to discuss our private consultations with other governments on such matters but, suffice to say, we have been engaged with Kazakhstan and many of our other international nonproliferation partners on this subject in particular over the past several years," he told the AP. "We will continue to have those discussions." Purified ore, or uranium oxide, is processed into a uranium gas, which is then spun and re-spun to varying degrees of enrichment. Low enriched uranium is used for nuclear fuel, and upper-end high enriched uranium for nuclear weapons. Iran is under three sets of Security Council sanctions for refusing to freeze its enrichment program and related activities that could be used to make nuclear weapons. Teheran denies such aspirations, saying it wants to enrich only to fuel an envisaged network of power reactors. Any attempt to import such a large amount of uranium ore would be in violation of those sanctions, which ban exports to the Islamic Republic of all items, materials, equipment, goods and technology that could contribute to its enrichment activities. In addition, transfers of uranium ore in quantities greater than 500 kilograms annually are subject to close scrutiny by the Nuclear Suppliers Group of countries exporting atomic technology and materials. Teheran still has hundreds of tons of uranium hexafluoride - the gas that is spun by centrifuges into enriched uranium. But its stockpile of uranium oxide, from which the gas is derived, is thought to be rapidly diminishing. The IAEA believes that Iran's rapidly expanding enrichment program has been built on 600 tons of so-called "yellowcake" or uranium oxide imported from South Africa during the 1970s as part of plans by the former regime to build a network of nuclear reactors. But the Washington-based Institute for Science and International Security said earlier this year that, based on 2008 IAEA statistics, Iran had already used up close to three-quarters of its South African supply. In a November report, the IAEA noted that Iran had stopped producing uranium gas from yellowcake in early August and said Iranian officials had notified the agency that the production facility was down for maintenance. But David Albright, head of the Institute for Science and International Security, said Tuesday that the facility at the city of Isfahan had produced very little for about a year. "They said it was closed for maintenance but the reality is they probably ran out of uranium," he said. Kazakhstan is among the world's three top producers of uranium, accounting for more than 8,500 tons last year. Iran, in contrast is producing an estimated 20 tons a year - far too little to power even one large reactor let alone the network is says it wants to put in place.