Subscriber content previewBy MICHAEL CASEYAssociated PressAP Photo/Ellen Schmidt [enlarge] A cyberattack earlier this week targeted the operating technology at over 30 water systems in Minnesota, including the city of Plymouth, where a water tower can be seen here on July 30. Michigan on Saturday joined Minnesota in reporting cyberattacks on nine of the state's water systems, but an official said all systems were operating “safely.”