Federal and state officials in the U.S. are investigating a series of cyberattacks on water and wastewater systems that hit at least seven states this week. The probe includes whether Iran is behind the intrusions, according to officials. CBS News has learned that the investigation is looking into more than 30 community water systems across Minnesota, where the attacks appear to have been concentrated. The scope of the attacks and what data, if any, was compromised remain under review. Officials have not named a suspect group but said the possibility of Iranian state involvement is part of the inquiry. The affected systems serve small and mid-sized communities, and the investigation is ongoing. The news comes amid heightened concerns about cyber threats to critical infrastructure in the United States.