The head of the Documentation Center of Cambodia, which has provided hundreds of thousands of documents to the Khmer Rouge tribunal, addressed the court on Wednesday to vouch for the accuracy of the research.

Defense attorneys for three jailed regime leaders have challenged the authenticity of documents from the well-established organization, which has collected documentation on Khmer Rouge atrocities for nearly 15 years.

Chhang Youk told the court that documents were thoroughly vetted and that the age of the paper, dates, signatures and other proof are used to verify their authenticity. Chhang Youk is scheduled to appear before the Trial Chamber on Thursday.

He told the court Wednesday he had established the center for the purpose of national reconciliation in the wake of Khmer Rouge atrocities and that he hoped the UN-backed court would provide accountability for the leaders of the regime.