The body of the slain Iranian supreme leader Ali Khamenei is to be buried in a Shiite shrine in his home city of Mashhad.
The Iranian foreign ministry spokesman said Iran and Saudi Arabia would exchange ambassadors after the reopening of their diplomatic mission.
There have been more than 3,100 reported cases of poisoning involving more than 100 schools, according to Iranian media.
Majidreza Rahnavard was accused by the court of “waging war against God.”
An Afghan refugee was executed in Iran on Monday for the murder of two Shiite clerics earlier this year.
A passenger train partially derailed in eastern Iran early Wednesday, killing 17 people, authorities said.
