BBC reported that at least 650 girls have been poisoned by toxic gas in Iran since November, in what many believe is a deliberate attempt to force their schools to shut.
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. However, he later said that his remarks had been misinterpreted.
The prosecutor general announced last week that he was opening a criminal investigation, but he said that the available information only indicated “the possibility of criminal and premeditated acts”.