TEHRAN , Iran ( CNN ) -- Iran 's supreme leader on Friday rejected opposition claims that last week 's presidential elections were rigged , describing President Mahmoud Ahmadinejad 's win as `` definitive '' and demanding an end to days of protests . Ayatollah Ali Khamenei made his first address since the June 12 presidential elections . In his first speech since the June 12 election outcome sparked the country 's worst unrest in 30 years , Ayatollah Ali Khamenei said the vote accurately reflected the will of the people and accused `` enemies of Islam '' of stoking anger . He warned opposition leaders , who are planning a new rally on Saturday , against staging further demonstrations , saying they would be held accountable for any violence . The `` Islamic establishment would never manipulate votes and commit treason . The legal structure in this country does not allow vote-rigging , '' Khamenei said , in his first address since the elections . He told a large crowd at Tehran University that the `` historic '' 85 percent turnout of more than 40 million people was a `` political earthquake '' and was too large to have been manipulated . `` There is a difference of 11 million votes . How can vote-rigging happen ? '' he added . Watch Khamenei dismiss claims of fraud » . Ahmadinejad , whose hardline policies have antagonized Western nations , claimed victory with more than 62 percent of the votes , surprising many experts who had predicted a stronger showing from main opposition leader Mir Hossein Moussavi . The Ayatollah 's speech was likely to come under heavy scrutiny in Iran , amid expectations that , despite conciliatory comments , his strong endorsement of Ahmadinejad will do little to appease Moussavi 's emboldened supporters . Read about Iran 's power structure » . Moussavi 's allegations of ballot fraud and calls for a fresh vote have rallied thousands on the streets of Tehran and other cities , in scenes not witnesses in country since the Islamic Revolution of 1979 toppled its monarchy . The unrest prompted Iran to place restrictions on foreign media , limiting their reports on six days of street protests , police arrests and some outbreaks of violence that have left at least eight people dead . Watch militia crackdown » . Khamenei described the dispute over the election outcome as a disagreement within Iran 's establishment , accusing `` foreign enemies '' and `` Zionists '' -- including the United States , Britain and Israel -- of fomenting violence , and criticizing international media coverage of the unrest . Britain 's Foreign Office confirmed shortly after the speech that it was summoning Iran 's London ambassador in response to Khamenei 's comments . His speech was punctuated with exhortations from the crowd , including : `` Allah is Great , '' `` Death to Israel , '' `` Death to America , '' and `` Death to Britain . '' Expressing support for Ahmadinejad , Khamenei accused rival election candidates of insulting the president in the run-up to the vote . `` They swore and called the president superstitious and called him names , which is embarrassing . They forgot about morality and law , '' he said . Khamenei , who has authorized a partial vote recount , said proper legal channels should be used for any challenge to the election outcome . He called for an end to street protests , warning that perpetrators of violence would face punishment . On Thursday , tens of thousands of demonstrators took to the streets of Iran 's capital for the sixth day in a row . Some estimates put the total number of participants in the hundreds of thousands . See where protests have taken place » . Moussavi spoke through a bullhorn from atop a building to the throngs of marchers who snaked through the city , in what was described as a peaceful protest . He spoke hours after the Iranian government agreed to meet with candidates for crisis talks to discuss complaints stemming from the election . With restrictions on reporting the unrest , much of the news , video and images emerging from Iran have come via social networking sites , often bypassing authorities ' attempts to block applications such as Facebook and Twitter . CNN 's Chief International Correspondent Christiane Amanpour described Khamenei 's address as a heartfelt defense of Iran 's establishment but said it was uncertain the opposition would heed his call to end demonstrations . Watch Amanpour discuss speech . » . `` That 's the all important question . Whether or not the leaders of the opposition -- Mir Hossein Moussavi -- will call on these people to stop their protests is unclear , '' she said . `` Whether they will end and whether the people on the the streets will listen -- because the protests have been spontaneous . It will be intersting to see after this call from the supreme leader , from whom all power in Iran flows . '' Moussavi , who called for a boycott of Khamenei 's prayer sermon , was absent from the audience , which included Ahmadinejad and , next to him , parliamentary speaker Ali Larijani , who has previously had a tense relationship with the president . Former President Ali Akbar Hashemi Rafsanjani , who has been in a power struggle with Khamenei , was not visible on the TV broadcast of the event . Rafsanjani is chairman and overseer of the Assembly of Experts -- which is responsible for appointing or removing the supreme leader . iReport.com : Share images from Iran . In his speech , Khamenei defended Rafsanjani from charges of corruption made by Amhadinejad during a pre-election debate . However , he opened the door to corruption charges against Rafsanjani 's relatives . In discussing Iran 's support of human rights , Khamenei slammed U.S. policies in Afghanistan and Iraq . He even made an apparent reference to the deaths of people -- what he called the `` burning alive '' of 80 men , women and children -- during the federal siege of the Branch Davidian complex in Waco , Texas in 1993 . `` We have raised the flag of human rights through Islam , '' Khamenei said . There have been arrests and casualties in civil unrest , with human rights group Amnesty International saying reports suggest that up to 15 people have died . The government maintains seven people have died . Iranian TV Thursday night aired confessions from people who authorities say were paid to destabilize Iran . It aired remarks from some `` terrorists '' who said the United States paid them to enter from Iraq to committing terrorist acts against the Iranian leadership . CNN 's Badi Badiozamani contributed to this report .
Iran 's supreme leader rejects claims of ballot rigging in presidential vote . Ayatollah Khamenei delivers first speech since election outcome sparked unrest . He criticizes protests , says those who caused violence would be held accountable . He also criticizes international media for how they have portrayed the election .