Investigators probe whether Iran was behind cyberattack on water systems in 7 states

Investigators are looking into whether Iran was behind cyberattacks on public water systems in at least seven states. Officials in Michigan and Minnesota say their water systems are operating safely after the attacks. CBS News cybersecurity expert and analyst Chris Krebs explains what to know.

Michigan joined Minnesota in announcing cyberattacks on its state water supply, saying nine systems were the target of attacks that intelligence officials have blamed on Iran.