Turkey: The children each received a doll and a sword. Then they were lined up, more than 120 of them, and given their next lesson by their Islamic State group instructors: Behead the doll.

A 14-year-old who was among the line of abducted boys from Iraq's Yazidi religious minority said at first he couldn't cut it right, he chopped once, twice, three times. "Then they taught me how to hold the sword, and they told me how to hit.