Protests have swept Iran since the September 16 death in custody of Mahsa Amini, a 22-year-old Iranian of Kurdish origin arrested by the morality police for allegedly flouting the sharia-based law.The hijab headscarf became obligatory for all women in Iran in April 1983, four years after the Islamic Revolution that overthrew the US-backed monarchy.Hundreds killedAfter the hijab law became mandatory, with changing clothing norms it became commonplace to see women in tight jeans and loose, colourful headscarves.The Union of Islamic Iran People Party, formed by relatives of former reformist president Mohammad Khatami, on Saturday demanded the authorities "prepare the legal elements paving the way for the cancellation of the mandatory hijab law".Iran accuses its sworn enemy the United States and its allies, including Britain, Israel, and Kurdish groups based outside the country, of fomenting the street protests which the government calls "riots"."