S. Korea offers North talks over Kaesong, warns on refusal

South Korea on Thursday offered North Korea formal talks to resolve the suspended operations at their joint Kaesong industrial zone, and warned of "grave action" if Pyongyang declines.

"We officially propose talks between government authorities," Unification Ministry Spokesman Kim Hyung-Seok, adding that Pyongyang should reply to the offer by Friday.

"If North Korea rejects these proposed official talks, we would have to take grave action," Kim said, without elaborating.