Over 800 people have been poisoned after eating toxic wild mushrooms in around 10 provinces in the west of Iran.
At least 11 people have died from the effects of the deadly fungi and hundreds more have been hospitalised.
There is no effective treatment for such poisoning, Iran's Tasnim News Agency reports.
At least two people have received liver transplants. The mushrooms concerned look similar to edible ones.
People have been urged not to purchase loose mushrooms and only buy those packed and sealed in shops.
According to BBC Persian, mushrooms can sometimes be seen for sale in the street in Iran, and local people wisdom about which ones are safe to eat can be defective.
The deadly fungi grow wild in mountainous regions of Iran's west after spring showers, according to Tasnim.
Seven of the dead came from the Kermanshah area.
Reports suggest that unprecedented rainfall over the past month has led to more mushrooms growing than usual.
