Outgoing international co-investigating judge Mark Harmon yesterday called on the governments of Vietnam and Thailand to cooperate with the Khmer Rouge tribunal’s requests for documents pertaining to controversial Cases 003 and 004.

In a statement, Harmon – who recently tendered his resignation – said that in 2013, he issued three letters requesting the documents to Vietnam, and two to Thailand, but that “these efforts have proved futile”.

“Both governments have failed to produce relevant documents that could assist with the investigations and have not allowed investigators . . . access to specifically identified archives that contain relevant documents,” the statement reads.

It goes on to urge both countries “in the interests of justice, to comply fully with the outstanding requests for assistance”.

Cases 003 and 004 have been a source of contention for years, with a string of investigating judges – including Harmon – attempting to press forward, despite resistance on the court’s national side and assertions from the government that Case 002 will be the court’s last.

Representatives of the two embassies could not be reached yesterday.