SEOUL, South Korea – CPolice and South Korean officials were investigating the simultaneous shutdown Wednesday of computer networks at several major broadcasters and banks. While the cause wasn't immediately clear, speculation centered on a possible North Korean cyberattack. The shutdown came days after North Korea blamed South Korea and the United States for cyberattacks that temporarily shut down websites in Pyongyang. Officials at the two South Korean public broadcasters KBS and MBC said that all computers at their companies shut down at 2 p.m. The officials said the shutdown was not immediately causing any damage to their daily TV broadcasts. The officials declined to give their names saying they were not authorized to speak media. YTN cable news channel reported the company's internal computer network was completely paralyzed. Local TV showed workers staring at blank computer screens, and at one coffee shop employees asked for cash, saying their credit card machi
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