<A HREF="http://news.zdnet.com/2100-1009_22-6227090.html?tag=nl.e550">A cyberattack has caused a power blackout in multiple cities</A> outside the United States, the CIA has warned. The SANS Institute, a computer-security training body, reported the CIA's disclosure on Friday. CIA senior analyst Tom Donahue told a SANS Institute conference on Wednesday in New Orleans that the CIA had evidence of successful cyberattacks against critical national infrastructures outside the United States.

"We have information that cyberattacks have been used to disrupt power equipment in several regions outside the U.S.," Donahue said. "In at least one case, the disruption caused a power outage affecting multiple cities."

Donahue added that the CIA does not know who executed the attacks or why but that all of the attacks involved "intrusions through the Internet."