A cyberattack that targeted water systems in the US state of Minnesota earlier this week is suspected to be the work of a hacker group with ties to Iran, according to reports. The attack affected more than 30 water facilities across the midwestern state. Investigators said the methods used showed telltale signs of an Iranian-affiliated group. The breach raised concerns about the vulnerability of critical infrastructure to foreign cyber threats. The affected facilities were local water systems, but the exact nature and extent of damage remain under investigation. Authorities are probing the incident and have not released details on whether operations were disrupted or data was stolen. The incident adds to a growing list of cyberattacks on US critical infrastructure attributed to state-sponsored actors. No group has claimed responsibility as of now.