Iranian authorities say they are investigating after a series of poisonings at girls’ schools. The latest such attack struck a school in the city of Pardis in Tehran province Tuesday. Nearly 700 schoolgirls have suffered toxic poisonings since November in what authorities have said is an attempt to shut down education for girls and could be linked to the nationwide women’s rights protests that took off in September following the death of 22-year-old Mahsa Amini in police custody. No students have been killed in the attacks, but many have reported respiratory problems and other health effects.