Cyber Attack Hits South Korea March 20, 2013 - 6:45PM South Korea: Computer networks of several major South Korea broadcasters and banks were paralysed Wednesday afternoon in what police and government agencies were investigating as a cyber attack. The shutdowns in Seoul on Wednesday come days after North Korea blamed South Korea and the United States for cyber attacks that temporarily shut down websites in Pyongyang. Tensions between the countries are high over the North's nuclear ambitions. Officials at the two public broadcasters KBS and MBC said that all computers at their companies shut down at 2pm (1600 AEDT) on Wednesday. The officials declined to give their names, saying they were not authorised to speak to the media. YTN cable news channel reported the company's internal computer network was completely paralysed. "Members of our cyber team are investigating this now," a National Police Agency spokesman told AFP. Yonhap news agency said at least three broadcasters - KBS, MBC and YTN - and two banks reported that their computer networks had been paralysed. Earlier in the day, North Korea condemned training flights by nuclear-capable US B-52 bombers over the Korean peninsula as an "unpardonable provocation" and threatened military action if they continue. The Pentagon says at least one B-52 has flown over South Korea in recent weeks as part of joint South Korea-US military exercises that Pyongyang has denounced as rehearsals for invasion.