filmed, produced and directed by Marcel Mettelsiefen ; co-produced and edited by Stephen Ellis, A.C.E. ; senior producer, Dan Edge ; an ITN production for WGBH/Frontline in association with Channel 4 and ZDF
produced and directed by Joshua Baker ; a Frontline production with Mongoose Pictures in association with the Guardian. Hunting ISIS / produced and directed by Olivier Sarbil ; a Frontline production with Mongoose Pictures in association with Channel 4