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Wednesday, July 08, 2009 9:22:50 AM
Sites in South Korea were also affected, and South Korean intelligence officials believe the attack was carried out by North Korean or pro-Pyongyang forces.
The U.S. government Web sites, which also included those of the Federal Trade Commission and the Transportation Department, were all down at varying points over the holiday weekend and into this week. South Korean Internet sites began experiencing problems Tuesday.
U.S. officials refused to publicly discuss details of the cyber attack.
But South Korea's National Intelligence Service, the nation's main spy agency, told a group of South Korean lawmakers Wednesday it believes that North Korea or North Korean sympathizers in the South "were behind" the attacks, according to an aide to one of the lawmakers briefed on the information.
The aide spoke on condition of anonymity, citing the sensitivity of the information. The National Intelligence Service — South Korea's main spy agency — said it couldn't immediately confirm the report, but it said it was cooperating with American authorities.
Amy Kudwa, spokeswoman for the Homeland Security Department, said the agency's U.S. Computer Emergency Readiness Team issued a notice to
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federal departments and other partner organizations about the problems and "advised them of steps to take to help mitigate against such attacks."
Others familiar with the U.S. outage, which is called a denial of service attack, said the fact that the government Web sites were still being affected three days after it began signaled an unusually lengthy and sophisticated attack.
Two government officials acknowledged that the Treasury and Secret Service sites were brought down, and said the agencies were working with their Internet service provider to resolve the problem. The officials spoke on condition of anonymity because they were not authorized to speak on the matter.
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