It seems that no notice was taken of a similar incident in Israel in April 2020; the attack (trying to increase chlorine level in water supply) and infiltration method (taking over the controlling OS by remote access) may indicate that the same hackers were involved. https://www.timesofisrael.com/6-facilities-said-hit-in-irans-cyberattack-on-israels-water-system-in-april/
