"Iran's got bigger problems than worrying about Minnesota," said Trump.

Investigators cautioned that the assessment was preliminary. There were no indications that any water supply had been rendered unsafe to drink.

The cyberattacks were aimed at wells and treatment plants, specifically targeting automated systems and plants’ computer systems.

A cyberattack hit Minnesota’s municipal water systems.

State and federal authorities are investigating cyberattacks against remotely controlled water systems in Minnesota.