I could add to what Chile has said about technology—though, unfortunately, I'm no expert on it.
One of the things that was developed that I recall—and I wish I could remember the name of the app—was an app that would allow first responders, people who were on the ground who saw the sorts of things you're talking about, Mr. Sarai, to film this on their smart phones and then send it immediately up into the cloud so that it was protected and preserved. There were markers attached to that would preserve the location, time and all the rest of it. That's an example of the kind of technology that's available today.
Certainly, I can tell you that social media is an extraordinarily rich source of evidence. We built one entire case on social media of prisoners of war who were being shot, and the people who were doing it were putting what they were doing on social media and boasting about it. Of course, you can't just rely on that. You then have to authenticate it and support it with other evidence, but what Chile is talking about in terms of modern technology is very much a feature of criminal investigations, particularly at the international level now.
One of the difficulties is the mass of it, so the use of artificial intelligence to try to sort through it becomes very important, as is simply the application of human resources and the need to have enough people to go through this sort of material patiently. When you come right down on the ground with these things, it is just hard, smart work that generates the cases you need to bring in order to hold people accountable.
I hope that helps.