Officials from South Korea's National Intelligence Service have been briefing members of the National Assembly's intelligence committee on the recent CSIS report on North Korea's undeclared missile sites.
The agency said it was already aware of the current status of the Sakkanmol missile base mentioned in the CSIS report, adding activities there are not out of the ordinary.
They also briefed lawmakers on the North's current stockpiles, which include Rodong and Scud missiles.
The agency added that Seoul and Washington are keeping close tabs on the regime's nuclear and missile activities around the clock.