Almost 700 girls have been poisoned by toxic gas in Iran since November.
A report by the BBC states that many believe it is a deliberate attempt to force their schools to shutdown.
No girls have died, but dozens have suffered respiratory problems, nausea, dizziness and fatigue.
“It became evident that some people wanted all schools, especially girls’ schools, to be closed down,” the deputy health minister said on Sunday.
The prosecutor general announced last week that he was opening a criminal investigation. However, he said that the available information only indicated “the possibility of criminal and premeditated acts”.
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