South Korea said Monday that it has postponed an investor relations event planned for the end of the month at a joint inter-Korean factory park in Kaesong. The event that was originally set for Oct. 31 was arranged to attract foreign investors to set up factories at the Kaesong Industrial Complex, which is currently home to only South Korean companies, Yonhap news agency reported. South Korea notified the North of the postponement on Friday, citing a lack of progress made in talks to enhance communication and cross-border passage, the official said. As part of an agreement reached last month to resume operations at the zone, the two Koreas agreed to try to turn the industrial zone into an international industrial zone. The latest move, comes as inter-Korean relations have soured after Pyongyang unilaterally put off holding reunions for families separated across the border in the 1950-53 Korean War late last month. Since then, North has criticized South Korea’s President Park Geun-hye and its government for provoking tensions and warned that the communist country views various joint military exercises around the Korean Peninsula as drills to launch a nuclear attack against Pyongyang.