South Korea to work for tougher U.N. sanctions on North Korea: Yonhap

SEOUL (Reuters) - South Korea will make diplomatic efforts for stronger U.N. Security Council sanctions on North Korea after seismic activity, suspected of being from a nuclear test, was detected on Friday near the North's known nuclear test site, Yonhap news agency reported citing the South's foreign ministry. (Reporting by Jack Kim; Editing by Michael Perry)