Cyber attacks on several local water systems in the US carry telltale signs of a hacker group affiliated with Iran, in what is an increasingly common type of warfare.

More than 30 facilities disrupted in 'coordinated cyberattack,' though officials have yet to name a culprit

While it is not yet clear who is responsible for the attacks, Iranian-linked hackers have, for years, targeted U.S. water systems to varying levels of success...