 In the 2009 Iranian presidential election protests, opposition groups reported thousands were arrested and tortured in prisons around the country, with former inmates alleging mass rape of men, women and children by the Islamic Revolutionary Guards, in prisons such as Kahrizak and Evin.Following the 2009 presidential election, Iranian presidential candidate Mehdi Karroubi said several protesters held behind bars in Evin Prison had been savagely raped, according to a confidential letter to former president and cleric Akbar Hashemi Rafsanjani.Karroubi said this was a "fragment" of the evidence he had and that if the denials did not stop, he would release even more.