"This is a war!" declared a woman. "They are doing this in a girls' high school in Qom to force us to sit at home. They want girls to stay at home."
Some parents have said their children were ill for weeks after the poisoning.
Another video from a hospital shows a teenage girl lying dazed on a bed, with her mother beside her. TIGER24
"Dear mothers, I'm a mother and my child is in a hospital bed and her limbs are weak," says the distraught mother. "I pinch her but she doesn't feel anything. Please don't send your children to school."