According to a declassified intelligence report, North Korea had plans to attack nuclear power plants in the United States in the 1990s.
North Korea sent five commando teams to the U.S. to attack power plants and cities in the event of open conflict between the two countries, according to a Defense Intelligence Agency report dated September 13, 2004.
The North Korean ministry in charge of the military established five offices in the early 1990s for the purpose of training operatives to infiltrate power plants and American cities.
According to the report, North Korea was frustrated at the time at the slow progress in building a ballistic missile capable of reaching the U.S. This was before the development of North Korea’s intercontinental ballistic missiles.
North Korea is one country suspected of a sophisticated and damaging cyber-attack on Sony Pictures. Iran has been mentioned by U.S. officials as another suspect.