Australian jurist Michael Kirby is leading a three-member U.N. Commission of Inquiry on North Korea, which started its investigations last week in Seoul.
Kirby's team has interviewed dozens of witnesses who relayed accounts of alleged atrocities committed by the North Korean government.
Pyongyang said this week the commission was part of a smear campaign.
"The best way to counter the testimonies we have received and to suggest they are slander is to let an objective independent international body like us go and see the places of human rights violations allegations," Kirby was quoted by the Yonhap News Agency in South Korea as saying. "That should be able, in many cases, to settle the matter with one another quickly."
The commission said it was mandated to investigate claims of torture, religious persecution, prison camps and a wide range of other alleged human rights abuses.
Kirby suggested action was needed beyond statements of censure against North Korea but said the authority to do so rests with members of the international community.
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