Iranian state television broadcast detailed instructions on what to do in the event of a nuclear attack.
This announcement followed public discussions in the media about a possible US attack on the fortified underground Iranian nuclear complex at Mount Peaks (near Natanz).
Among the recommendations:
Don't look at the flash.
Lie on the ground behind the nearest solid shelter, covering your head and face with your hands.
You can't wait for two blast waves - direct and reverse - to pass.
Take shelter from radiation in the shelter and stay there for at least 24 hours.