The protests, sparked by the death of Mahsa Amini, a 22-year-old from Iranian Kurdistan, have spiralled into the biggest show of opposition to Iran's clerical authorities since 2019, with dozens killed in unrest across the country.In Tehran's traditional business district of Bazaar, anti-government protesters chanted "We will be killed one by one if we don't unite", while elsewhere they blocked a main road with a fence torn from the central reservation, videos shared by the widely followed Tavsir1500 Twitter account showed.The protests began at Amini's funeral on Sept. 17 and spread to Iran's 31 provinces, with all layers of society, including ethnic and religious minorities, taking part and many demanding Supreme Leader Ayatollah Ali Khamenei's downfall.The Revolutionary Guards said four members of its forces and the volunteer Basij militia were killed on Friday in attacks in Zahedan, capital of the southeastern Sistan-Baluchistan province.Fearing an ethnic uprising, and in a show of power, Iran launched rocket and drone attacks on targets in Iraq's Kurdish region this week after accusing Iranian Kurdish dissidents of being involved in the unrest."