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Some of the threats come from individuals who might have connections to Osama bin Laden's al-Qaeda network in Pakistan and elsewhere, those who have been briefed say.
The specific threats, in part, prompted a meeting April 18 of government intelligence and information-technology officials to discuss protecting the nation's computer networks.
"This threat is growing," Sen. Jon Kyl, R-Ariz., says. "It's a big threat, because it is easy to do and can cause great harm."
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