Sporadic protests continued in Iran on Sunday amid a widespread crackdown by security forces a year after a young Kurdish woman's death in custody set off some of the worst political unrest in four decades.

The death on Sept. 16 last year of Mahsa Amini, a 22-year-old Kurdish woman arrested by the morality police for allegedly flouting mandatory dress codes, triggered months of some of the biggest protests against the Islamic Republic's Shi'ite clerical rule ever seen and drew international condemnation.

On Saturday, Mahsa's father, Amjad Amini, was arrested briefly and warned against marking the anniversary of his daughter's death, the Kurdistan Human Rights Network said, and the family was not able to hold a planned vigil at her grave.