A leading Iranian Sunni cleric has called on the country’s Shia clerical leadership to organize a referendum, as security forces clashed with anti-government protesters in several mainly Sunni cities in the eastern province of Sistan and Baluchestan.The wave of protests that has convulsed majority Shia Iran for more than six weeks has caused one of the boldest challenges to the country's rulers since the 1979 Islamic Revolution.The protests have included cries calling for the death of Supreme Leader Ali Khamenei and the overthrow of the Islamic Republic.The nationwide protests were initially focused on the Islamic Republic's mandatory hijab policy, with crowds of young women removing their headscarves in the street.Zahedan was the scene of a violent crackdown on September 30 in which security forces killed 92 people, including 12 children, according to IranWire sources."