It has not yet been confirmed, but seems the probable senario. If it was not clear with Stuxnet we are in the age of cyberwar were digital attacks cause real world damage.
"Foreign hackers caused a pump at an Illinois water plant to fail last week, according to a preliminary state report. Experts said the cyber-attack, if confirmed, would be the first known to have damaged one of the systems that supply Americans with water, electricity and other essentials of modern life.
Companies and government agencies that rely on the Internet have for years been routine targets of hackers, but most incidents have resulted from attempts to steal information or interrupt the functioning of Web sites. The incident in Springfield, Ill., would mark a departure because it apparently caused physical destruction.
Federal officials confirmed that the FBI and the Department of Homeland Security were investigating damage to the water plant but cautioned against concluding that it was necessarily a cyber-attack before all the facts could be learned. “At this time there is no credible corroborated data that indicates a risk to critical infrastructure entities or a threat to public safety,” said DHS spokesman Peter Boogaard."