what became clear pretty early on was that these men weren't just sort of roaming around the shops, you know, they weren't just strolling around the street in raqqa saying hello to people in the cafe. these were protected people, so protected they were conscious of their digital footprint, they were conscious of their location. because remember, you know, the uk government wanted to track them down. and actuallyjihadi john, mohammed emwazi, was eventually killed by a drone strike, and they knew that they were wanted men. so, we had no direct contact with them. the next thing that happened was that, mysteriously, suddenly they turned up in a kurdish prison. just before we get into the detail of how you then met two of them, just let's talk about the victims and their families. you know, just remind us who were the victims.