Caves and crypto: The secrets behind the return of ISIS

Islamic State is on the rise, once more a threat to the international community. Driven from its strongholds in Syria and Iraq, the terror group has been building a new base in the mountains of Somalia.  
  
Sky’s special correspondent Alex Crawford has visited the cave network where Somali authorities believe the ISIS resurgence began - funded by crime and cryptocurrency in a sophisticated twist to their terror regime.   
  
Alex joined Niall Paterson on The Daily to discuss what she discovered and what it means for the UK and beyond.   
  
You can watch the full documentary, Hunting for ISIS: A Warning From Africa, here:  
 
https://www.youtube.com/watch?v=KdGr5uxqfak  
  
Producer: Olivia McGhie and Emily Hulme  
Editor: Mike Bovill