I've been following the stories on the Afghanistan prisoner massacre and mass grave, and the need for an investigation into possible US involvement. There's a diary on the rec list right now about it, in fact.
Inside that diary is a link to the "Convoy of Death" entry at Wikipedia concerning the documentary about the massacre. There I learned that the UN had confirmed that the mass grave had been disturbed.
Wondering why I hadn't heard this part of the story before now, I did another Google search on "Afghanistan mass grave disturbed." Dig through the details -- the possible smoking gun is at the end ...