DHS and FBI have found no evidence of a cyber intrusion into the SCADA system of the Curran-Gardner Public Water District in Springfield, Illinois. In a separate incident, a hacker recently claimed to have accessed an industrial control system responsible for water supply at another U.S. utility. ICS-CERT is assisting the FBI to gather more information about the separate Houston incident. There was no malicious or unauthorized traffic from Russia or any foreign entities, as previously reported, according to DHS.”]
Source: http://www.shoaibyousuf.com/2011/12/dhs-and-fbi-have-disputed-that.html