The long-range rocket North Korea launched on Wednesday was apparently equipped with cutting-edge navigational technology.
National Intelligence Service chief Won Sei-hoon told lawmakers on Thursday that analysis by NASA showed that the satellite mounted on top of the rocket left its trajectory faster than ordinary satellites.
Won said the North appears to have acquired "remote-controlled guidance technology" that caused the satellite to shift its path after being separated from the rocket.
This means North Korea also tested technology that could increase the accuracy of intercontinental ballistic missiles.
The North also apparently used technology from the Rodong-B missile, which has a range of 3,500-4,000 km, to build the first-stage booster.