Protesters in Iran chant against supreme leader

STORY: Iran's Revolutionary Guards have built up their presence in restive Kurdish regions, state media reported on Friday, amid a crackdown on mass protests.

The mass demonstrations that erupted after the September 16 death in custody of 22-year-old Kurdish woman Mahsa Amini spread rapidly across the country but have been most intense in areas populated by ethnic minorities, many of whom are Sunni Muslims.

The unrest has posed one of the biggest challenges to Iran's Shi'ite clerical rulers since they came to power in the 1979 Islamic Revolution, with previous bouts of sustained protest eventually being crushed.