Enforcement Police and reinforcement of the embassy guards". Iranian police arrested 12 protesters in connection with the attack. Two Iranian opposition student groups, Tahkim Vahdat and Advar Tahkim, issued statements criticising the attack. Tahkim Vahdat said that those behind it were "not true representative of Iranian students, they were affiliated with the authorities in power". Iran's Deputy Police Chief Brigadier General Ahmad Reza Radan announced that police have started investigations into the details of the protests, in which angry self-driven protesters raided and occupied the British embassy and its garden in Northern Tehran. Iranian MP Parviz Sorouri, a senior member of the Majlis National Security and Foreign Policy Committee, said that "the British government's hasty decision to close down the Iranian Embassy in London has created a new situation for both sides. But the Iranian government will do its utmost to stand up for the rights of Iranian citizens living in Britain through the establishment of an interests section in London". Subsequently, the Sultanate of Oman agreed to act as a protecting power, representing the interests of Iran through its embassy in London. Within the United Kingdom Following the incident, the Foreign and Commonwealth Office issued a statement saying that "we are outraged by this. It is utterly unacceptable and we condemn it". Later that evening David Cameron described the Iranian Government's failure to protect the embassy as a "disgrace". On 30 November 2011, during a speech to the House of Commons, Foreign Secretary William Hague announced that the Iranian Ambassador to the Court of St. James's, his ambassadorial staff and other Iranian diplomats had 48 hours to leave the United Kingdom. The foreign secretary also announced that he had closed the British Embassy, and its staff and dependants had left Tehran. This brought the United Kingdom's relations with Iran to their lowest level, and both the Foreign Secretary and Prime Minister had warned of far more "serious consequences" towards Iran, for its failure to uphold its international obligations in line with the Vienna Convention. Deputy Prime Minister Nick Clegg told the BBC's Sarah Rainsford that the UK's relationship with Iran had "taken a very serious knock" but that "It doesn't mean we're cutting off all diplomatic relations with Iran. It doesn't mean we are in any way lessening our determination to try to find a diplomatic solution to the nuclear question, which is immensely important to Europe and the