NEW : At least 72 die nationwide , an opposition group reports . ' CNN 's Frederik Pleitgen contributed to this report . : This includes the dead in a ` ` horrible way , '' says the group . The U.S. has offered to stop Iran 's ` ` of chemicals '' Private companies are trying to destroy the more common chemicals .
NEW : At least 72 die nationwide , an opposition group reports . ' : This includes the dead in a ` ` horrible way , '' says the group . The U.S. has offered to stop Iran 's ` ` of chemicals '' Private companies are trying to destroy the more common chemicals .