When Rosa, now 14, asked her Islamic State captors about her younger sisters, Bushra, 12, and Suhayla, 7, she was told they had been killed for misbehaving.

¡°At that point, I didn¡¯t care about anything anymore. Even if I died,¡± she said. ¡°I never thought I¡¯d see them again.¡±

The sisters were finally reunited on Sunday, more than three years after being taken by the militants in an assault on Sinjar, the Yazidi heartland, on Aug. 3, 2014.