By Parisa Hafezi DUBAI (Reuters) -Iranian riot police and security forces clashed with demonstrators in dozens of cities on Tuesday, state media and social media said, as protests raged on over the death of young Iranian woman Mahsa Amini in police custody. Amini, 22, from the northwestern Kurdish city of Saqez, was arrested on Sept. 13 in Tehran for “unsuitable attire” by the morality police who enforce the Islamic Republic’s strict dress code. She died three days later in hospital after falling into a coma, sparking the first big show of opposition on Iran’s streets since authorities crushed…