Stuxnet may have been the Shot heard round the world but we think its likely that 2012 will witness a number of other skirmishes. The warning signs are already there evidence of infected SCADA systems can readily be found online. The nation-state sponsored malware arms race is on, with malware linked to foreign governments hostile to (or allied with) the U.S. and Western nations infecting and disrupting critical infrastructure from power generation to telecommunications to water treatment.
Source: https://threatpost.com/stuxnet-part-ii-iii-and-iv/91900/