The federal government issued a warning Thursday about potential cyber threats to water systems after 30 water plants in Minnesota were hit with cyberattacks that multiple U.S. officials tell ABC News may have been linked to Iran.
The Cybersecurity and Infrastructure Security Agency (CISA) said in an alert that cyber threat actors are targeting programmable logic controllers (PLCs) and modifying passwords to "to lock out operators."
"This activity has resulted in boil water notices and sustained manual operations," CISA said.
The alert comes two days after Minnesota officials revealed state water systems were hit with a cyber attack on Sunday and Monday.
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