Families in Iran are accusing the authorities of failing to stop a months-long series of poison attacks on schoolgirls. More than 13,000 cases of gas poisoning have been registered. Amnesty International says the attacks have targeted 300 girls' schools. Some government critics believe the poisonings are retaliation for last autumn's nationwide anti-regime demonstrations. But it's not clear who is responsible. Iran's Supreme Leader Ayotollah Ali Khamenei has described the poisonings as an 'unforgivable crime'.

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