This change drastically moved Iran's uranium toward bomb-grade material. Until now, the highest level of purity that had been found in Iran was 20 per cent. In late August, the IAEA set up an Iran Task Force to deal with inspections and other issues related to Iran's nuclear program, in an attempt to focus and streamline the IAEA's handling of Iran's nuclear program by concentrating experts and other resources into one dedicated team. On 30 August, the IAEA released a report showing a major expansion of Iranian enrichment activities. The report said that Iran has more than doubled the number of centrifuges at the underground facility at Fordow, from 1,064 centrifuges in May to 2,140 centrifuges in August, though the number of operating centrifuges had not increased. The report said that since 2010 Iran had produced about 190 kg of 20-per-cent-enriched uranium, up from 145 kg in May. The report also noted that Iran had converted some of the 20-per-cent-enriched uranium to an oxide form and fabricated into fuel for use in research reactors, and that once this conversion and fabrication have taken place, the fuel cannot be readily enriched to weapon-grade purity. The report also expressed concerns over Parchin, which the IAEA has sought to inspect for evidence of nuclear weapons development. Since the IAEA requested access, "significant ground scraping and landscaping have been undertaken over an extensive area at and around the location," five buildings had been demolished, while power lines, fences, and paved roads were removed, all of which would hamper the IAEA investigation if it were granted access. In a briefing to the Board of Governors on this report in early September 2012, IAEA Deputy Director General Herman Nackaerts and Assistant Director General Rafael Grossi displayed satellite images for its member states which allegedly demonstrate Iranian efforts to remove incriminating evidence from its facility at Parchin, or a "nuclear clean-up." These images showed a building at Parchin covered in what appeared to be a pink tarpaulin, as well as demolition of building and removal of earth that the IAEA said would "significantly hamper" its investigation. A senior Western diplomat described the presentation as "pretty compelling." The Institute for Science and International Security (ISIS) said that the purpose of the pink tarpaulin could be to hide further "clean-up work" from satellites. However, Ali Asghar Soltanieh, Iran's envoy to the IAEA, denied the contents of the presentation, saying that "merely having a photo from up there, a satellite imagery ... this is not the way the agency should do its professional job."