The poisoning incidents have been reported at more than 30 schools in at least four Iranian cities since November, prompting some parents to take their children out of school.
Mir Hossein Mousavi says he does not believe country's current system still works, while the country's Supreme leader pardons "tens of thousands" of prisoners, according to state media.
The EU and the UK introduce new sanctions against Iran for its violent crackdown on domestic protesters, but the EU says it will not yet designate the Iranian Revolutionary Guard as a terrorist group without a court order.
Social media videos showed flames at the house, which was turned into a museum commemorating the 1979 Iranian Revolution's leader Ruhollah Khomeini, with crowds of jubilant protesters marching past.
Protests erupted across Iran on September 16, when Amini died after falling into a coma following her arrest in Tehran by the morality police for an alleged breach of the country's strict dress code for women.
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