Several North Korean missiles were recently spotted moved from a rocket facility in the capital Pyongyang, South Korea's Korean Broadcasting System (KBS) reported late on Friday.
The report cited an unnamed intelligence source saying South Korean and US intelligence detected missiles being transported away from North Korea's Missile Research and Development Facility at Sanum-dong in the northern part of Pyongyang.
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The report did not say when or where they had been moved.
The missiles could be either intermediate range Hwasong-12 or intercontinental ballistic Hwasong-14 missiles, according to the report, though the missile facility at Sanum-dong has been dedicated to the production of intercontinental ballistic missiles.
South Korean officials have voiced concerns that North Korea could conduct more provocative acts near the anniversary of the founding of its communist party on October 10, or possibly when China holds its Communist Party Congress on October 18.