Tribunal judges say they are nearly finished preparing a case for jailed Khmer Rouge prison chief Duch and hope to have a first trial-phase hearing in July.
Duch, 65, spent two days last week touring former Khmer Rogue sites with witnesses, and two more days being confronted by the witnesses against him.
All this was to help investigating judges in their case, and they now say they are moving toward the "trial phase" of the proceedings.