The man who smuggled Shamima Begum to Syria claims he was spying for Canada. What's the truth? And could she and her school friends have been stopped from reaching the Islamic State group?

Reporter: Josh Baker Written by: Josh Baker and Joe Kent Producers: Josh Baker, Sara Obeidat and Joe Kent Field producers: Hussam Hammoud Composer: Firas Abou Fakher Theme music: Sam Slater and Gunni Tynes Mix and sound design: Tom Brignell Production coordinator: Janet Staples Series Editor: Jonathan Aspinwall Head of Long Form Audio: Emma Rippon Commissioning Executive: Dylan Haskins

ARCHIVE: SKY News: New Footage 'Of British IS Schoolgirls' (March 2015)