Authorities say a hacker gained access to a Florida city’s water treatment plant in an unsuccessful attempt to fill the water supply with a potentially harmful chemicalA hacker remotely gained access to a Florida city’s water treatment plant in an unsuccessful attempt to fill the water supply with a potentially harmful chemical, authorities said. An unknown suspect breached a computer system for the city of Oldsmar's water treatment plant on Friday and briefly increased the amount of sodium hydroxide from 100 parts per million to 11,100 parts per million, Pinellas County Sheriff Bob Gualtieri said during a news conference Monday....