DUBAI, March 4 (Reuters) - Worried parents protested in Iran's capital Tehran and other cities on Saturday over a wave of suspected poison attacks that have affected schoolgirls in dozens of schools, according to Iranian news agencies and social media videos. The outbreak of schoolgirl sickness comes at a critical time for Iran's clerical rulers, who have faced months of anti-government protests sparked by the death of a young Iranian woman in the custody of the morality police who enforce strict dress codes. "It is one of the immediate priorities of Iran's government to pursue this issue as quickly as possible and provide documented information to resolve the families' concerns and to hold accountable the perpetrators and the causes," Foreign Ministry spokesperson Nasser Kanaani told state media