In his first comments on the mystery poisonings, Iran's Supreme leader Ayatollah Ali Khamenei said those behind the school poisonings should face "severe punishment".
More than a thousand female students have fallen ill since last November.
In his first comments on the mystery poisonings, Iran's Supreme leader Ayatollah Ali Khamenei said those behind the school poisonings should face "severe punishment".
More than a thousand female students have fallen ill since last November.