enrich uranium." On 14 April 2006, the Institute for Science and International Security published a series of analyzed satellite images of Iran's nuclear facilities at Natanz and Esfahan. Featured in these images is a new tunnel entrance near the Uranium Conversion Facility at Esfahan and continued construction at the Natanz uranium enrichment site. In addition, a series of images dating back to 2002 shows the underground enrichment buildings and its subsequent covering by soil, concrete, and other materials. Both facilities were already subject to IAEA inspections and safeguards. On 28 July 2006, the UN Security Council approved a resolution to give Iran until the end of August to suspend uranium enrichment or face the threat of sanctions. Iran responded to the demand to stop enrichment of uranium 24 August 2006, offering to return to the negotiation table but refusing to end enrichment. Majlis speaker Qolam Ali Hadad-adel said on 30 August 2006, that Iran had the right to "peaceful application of nuclear technology and all other officials agree with this decision," according to the semi-official Iranian Students News Agency. "Iran opened the door to negotiations for Europe and hopes that the answer which was given to the nuclear package would bring them to the table." In Resolution 1696 of 31 July 2006, the Security Council demanded that Iran suspend all enrichment and reprocessing related activities. In Resolution 1737 of 26 December 2006, the Council imposed a series of sanctions on Iran for its non-compliance with Resolution 1696. These sanctions were primarily targeted against the transfer of nuclear and ballistic missile technologies and, in response to concerns of China and Russia, were lighter than that sought by the United States. This resolution followed a report from the IAEA that Iran had permitted inspections under its safeguards agreement but had not suspended its enrichment-related activities. UN Security Council The UN Security Council has passed eight resolutions on Iran's nuclear program: Resolution 1696 (31 July 2006) demanded that Iran suspend its uranium enrichment activities, Resolution 1737 (23 December 2006) imposed sanctions after Iran refused to suspend its enrichment activities, required Iran to cooperate with IAEA, Resolution 1747 (24 March 2007) expanded the list of sanctioned Iranian entities, Resolution 1803 (3 March 2008) extended those sanctions to additional persons and entities, Resolution 1835 (27 September 2008) reaffirmed the preceding four resolutions, Resolution 1929 (9 June 2010) imposed a complete arms embargo on Iran, banned