SEOUL, North Korea stopped the operation of its 5-megawatt reactor at its mainstay nuclear complex in Yongbyon, north of Pyongyang, late last year with no signs of reprocessing activities there, South Korea's spy agency said Tuesday.

During a briefing to the National Assembly's intelligence committee, the National Intelligence Service (NIS) also said that the underground tunnels of the North's nuclear test site in Punggye-ri remain shut down and unattended since their destruction in May last year, according to lawmakers of the committee.

Source: Yonhap news Agency