South Korean companies operating at a joint industrial estate in North Korea have said they face bankruptcy in many cases because of icy cross-border relations, Agence France-Presse reported. In a joint statement they demanded that the South Korean government improve ties with the North so that the Kaesong estate can run normally. The factory bosses also demanded that the communist North withdraw "unilateral and unacceptable" wage and rent demands, ease restrictions on border crossings and guarantee the safety of South Koreans working there.