In this Thursday, Sept. 20, 2012 file photo, North Korean students use computers in a classroom with portraits of the country's later leaders Kim Il Sung, left, and his son Kim Jong Il hanging on the wall at the Kim Chaek University of Technology in Pyongyang, North Korea. Key North Korean websites were back online Tuesday, Dec. 23, 2014 after an hours-long shutdown that followed a U.S. vow to respond to a cyberattack on Sony Pictures that Washington blames on Pyongyang. (AP Photo/Vincent Yu, File)

SEOUL, South Korea (AP) — Key North Korean websites suffered intermittent outages Tuesday after a nearly 10-hour shutdown that followed a U.S. vow to respond to a crippling cyberattack on Sony Pictures that Washington blames on Pyongyang.

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