Five years ago this month, Danisch Farooqi dropped off his daughter, Aaliya, at her mother's house in the German port city of Hamburg.
He remembers walking the girl, then almost 4, to his ex-wife's front door and hugging her.
"And I said, 'I'll see you next week,' " he recalls.
A few days later, he received a call from an unknown number in Turkey. It was his ex-wife's new husband. He told Farooqi he was in Turkey, recovering from injuries sustained while fighting in Syria. He'd brought the whole family to Turkey, including Aaliya.