Key infrastructure systems of 3 US cities Under Attack By Hackers. Key systems commonly known as Supervisory Control and Data Acquisition (SCADA) are increasingly being targeted by hackers. The hackers could theoretically have dumped sewage into a lake or shut off the power to a shopping mall. The firms that run SCADA systems, such as Siemens, often advise against changing passwords because the threat from malware is not a big a problem as if passwords are changed. Security experts predict there will be a rise in such attacks.
Source: https://thehackernews.com/2011/12/key-infrastructure-systems-of-3-us.html