in connection with the alleged studies, nor does it have credible information in this regard." May 2008 report On 26 May 2008, the IAEA issued another regular report on the implementation of safeguards in Iran, in which the IAEA has been able to continue to verify the non-diversion of declared nuclear material in Iran, and Iran has provided the IAEA with access to declared nuclear material and accountancy reports, as required by its safeguards agreement. Iran had installed several new centrifuges, including more advanced models, and environmental samples showed the centrifuges "continued to operate as declared", making low-enriched uranium. The report also noted that other elements of Iran's nuclear program continued to be subject to IAEA monitoring and safeguards as well, including the construction of the heavy water facility in Arak, the construction and use of hot cells associated with the Tehran Research Reactor, the uranium conversion efforts, and the Russian nuclear fuel delivered for the Bushehr reactor. The report stated that the IAEA had requested, as a voluntary "transparency measure", to be allowed access to centrifuge manufacturing sites, but that Iran had refused the request. The IAEA report stated that Iran had also submitted replies to questions regarding "possible military dimensions" to its nuclear program, which include "alleged studies" on a so-called Green Salt Project, high-explosive testing and missile re-entry vehicles. According to the report, Iran's answers were still under review by the IAEA at the time the report was published. However, as part of its earlier "overall assessment" of the allegations, Iran had responded that the documents making the allegations were forged, not authentic, or referred to conventional applications. The report stated that Iran may have more information on the alleged studies, which "remain a matter of serious concern", but that the IAEA itself had not detected evidence of actual design or manufacture by Iran of nuclear weapons or components. The IAEA also stated that it was not itself in possession of certain documents containing the allegations against Iran, and so was not able to share the documents with Iran. September 2008 report According to 15 September 2008 IAEA report on the implementation of safeguards in Iran, Iran continued to provide the IAEA with access to declared nuclear material and activities, which continued to be operated under safeguards and with no evidence of any diversion of nuclear material for non-peaceful uses. Nevertheless, the report reiterated that the IAEA