Tehran, March 8 -- The Iranian Ministry of Interior announced that many arrests have been made regarding the poisoning of female school students during the last months, Iranian media reported on Tuesday.

"We have arrested people in six provinces. Investigations are still being carried on. The results will be announced once the investigations are completed and clear results are obtained," Tasnim news agency quoted the assistant interior minister for security affairs.

This announcement came a day after Iranian Supreme Leader Ali Khamenei called on the country's officials to take up the case of female students' poisoning "seriously," saying that it was "an unforgivable crime."

In recent months, several schools in Tehran have reported case...