US warns of Iran-affiliated cyberattacks on critical infrastructure across country

Security agencies say municipalities should watch out for unusual activity, especially in water and energy sectors

• https://www.theguardian.com/world/live/2026/apr/07/iran-war-live-updates-trump-hormuz-threats-deadline-strikes-middle-east-conflict">Middle East crisis – live updates

Top government security agencies issued a warning of Iran-affiliated cyberattacks on critical infrastructure across the US on Tuesday.

In a https://www.ic3.gov/CSA/2026/260407.pdf">joint statement, the agencies say that municipalities, especially in the water and energy sectors, should be on the lookout for unusual activity.

“Cyberattacks on drinking water and wastewater systems directly threaten public health and community resilience,” Jeffrey Hall, an assistant administrator for enforcement and compliance assurance for the Environmental Protection Agency (EPA), said in a statement. “A single breach can disrupt treatment or introduce contaminants, damage equipment, and erode public trust.”