What do we know about suspected poisonings of schoolgirls in Iran?

More than 1,000 girls appear to have suffered mild poison' attacks since November

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More than 1,000 Iranian girls in schools across the country appear to have suffered mild poison" attacks since November, when the first cases emerged in the city of Qom, according to state media and officials.

The suspected attacks have been described by some observers as part of an extremist response - perhaps with tacit state endorsement - to the protests led by women and girls that have convulsed Iran since the death of Mahsa Amini in September.