Seifeddine Rezgui, 23, was studying electronics when he joined Islamic State and turned a gun on a beach full of tourists in Sousse, Tunisia, leaving 38 people dead. But what makes a student become a mass murderer? Special correspondent Fergal Keane travelled to Rezgui's hometown of Gaafour to meet his friends and family. Subscribe to BBC News HERE Check out our website: Facebook: Twitter: Instagram:
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