It's a great question. There are a couple of different actors. There are some wonderful NGOs that have been doing work. There's a local NGO called Yazda, which has been working to try to document crimes committed against Yazidis, including around Mount Sinjar. They've been doing mapping exercises.
The International Commission on Missing Persons, ICMP, has been also working to support efforts to preserve evidence around mass graves. You have organizations like CIJA and Bill Wiley's team, who've been working to build specific cases through talking to victims to compile evidence. There are a number of different efforts currently under way. There's publicly available information about it.
The challenge is that it is not necessarily being undertaken across Nineveh. It's tended to focus particularly, for example, on crimes against Yazidis, not so much on crimes against Christians, Shabak, Turkmen, and others. Some focus on physical evidence; some focus on testimony; we need a more comprehensive approach, and we need it to be done by an entity, an independent and international entity, that can make that material available to all relevant actors who are going to seek justice and accountability efforts going forward.