The unification ministry said while the North's regime took 70 per cent of the Kaesong workers' wages to fund state projects including arms development, it was unclear how much was funnelled into the nuclear and missile programmes.
Earlier today, unification minister Hong Yong-Pyo admitted there was no "clear evidence" what percentage of wages paid to the North Korean workers was used to fund Pyongyang's nuclear programme.
Hong had claimed yesterday about 70 per cent of wages paid to North Korean workers at Kaesong were syphoned off to the North's ruling Workers' Party and used to develop nuclear weapon and missiles, or purchase luxury goods.
The shock pullout sharply escalated tension and imposed huge losses on the 124 South Korean firms operating at the industrial park. Hong's comments yesterday sparked controversy over whether Seoul had been helping fund the North's widely-condemned weapons programmes.
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However Hong, pressed by Seoul lawmakers to present clear evidence to back up his claim, said today he was simply "expressing concern" over such a possibility, according to Yonhap news agency.
"There are concerns about the North's misuse of the money, but I've not said that there is clear evidence," he said before apologising for "creating so much misunderstanding," according to Yonhap.
The zone, which sits 10 kilometres north of the tense border, was officially shut last Thursday after Pyongyang expelled all South Korean managers and placed the complex under military control.
Since its opening in 2004, Seoul firms have paid wages worth USD 560 million -- including USD 120 million over last year alone -- to the North's state authorities supervising 53,000 workers at the complex.