Black-clad women in Iran's Sistan-Baluchistan province on Friday joined nationwide protests sparked by Mahsa Amini's death, in what a rights group called a "rare" move in the staunchly conservative region.Women-led protests have swept Iran since Amini, a 22-year-old Iranian of Kurdish origin, died following her arrest in Tehran for an alleged breach of the Islamic republic's dress code based on sharia law.Security forces have killed at least 448 protesters, with the largest toll in Sistan-Baluchistan on Iran's southeastern border with Afghanistan and Pakistan, according to Iran Human Rights, an Oslo-based non-governmental organisation.At least 128 people have been killed in Sistan-Baluchistan during the protest crackdown, according to IHR, by far its biggest toll for deaths recorded in 26 of Iran's 31 provinces."The Baluchi minority have borne the brunt of the vicious crackdown by security forces during the uprising that has swept across Iran since September," Amnesty said in a statement."