(Dec. 7) -- The computer virus Stuxnet, which some experts believe was created specifically to target Iran's nuclear facilities, could also threaten U.S. infrastructure, a senior Department of Homeland Security official says.

"That virus focused on specific software implementations, and those software implementations did exist in some U.S. infrastructure," Greg Schaffer, the department's assistant secretary for cybersecurity and communications, told reporters at a breakfast Monday morning. "So, there was the potential for some U.S. infrastructure.to be impacted at some level."
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