From Defense Tech:
Advance information did not prompt a response.
The U.S. Government now admits they did not properly handle the situation. Sources have revealed that the South Korean government knew in advance that the distributed denial of service (DDoS) attacks that hit multiple web sites of major institutions in South Korea had begun earlier in the United States.
Late last week South Korea's intelligence agency briefed its lawmakers on circumstantial and technical evidence behind their belief that North Korea was behind the recent cyber attacks. Other intelligence sources went as far as to state that Kim Chong Un, the third son of North Korean dictator Kim Jong Il, was the mastermind of the cyber attacks that have hit government computers in the United States, South Korea and other some 14 other countries.
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My Comment: I was not aware that there were warnings of an impending cyber attack.