Seifeddine Rezgui: What motivated a shy student to kill 38 holidaymakers in Tunisia

At 11.53 on Friday morning, Seifeddine Rezgui stood on the beach at Port El Kantoui in Sousse and made a 10-second telephone call on his white Samsung Galaxy mobile phone. The tall, handsome young man knelt down, produced a Kalashnikov AK-47 from within a rolled-up beach umbrella and test-fired a couple of rounds into the sand. Then he began the task of killing Western tourists.