The US Department of Homeland Security (DHS) issued a warning “on a computer network accessible only to authorized industry and government users” about an increased threat of a cyberattack against “US critical infrastructure organizations.” The intent appears to be not only theft of intellectual property, but “to disrupt … control processes.” The unclassified alert came from DHS’s Industrial Control System Computer Emergency Response Team (US-CERT). It made specific suggestions for steps to take to protect systems from harm. Another document listed indicators to determine if systems have been compromised.

http://www.washingtonpost.com/world/national-security/us-warns-industry-of-heightened-risk-of-cyberattack/2013/05/09/39a04852-b8df-11e2-aa9e-a02b765ff0ea_story.html