Asher Abid Khan sat in Istanbul's Ataturk Airport and considered his next move — forward to Syria and enlistment in the Islamic State, the militant group that had drawn him to the possibility of dying for Allah, or home to Texas and his bewildered family whose imploring messages were filling his voice mail.

The 19-year-old pulled out his phone and dialed.

"I want to come home," Khan told his father, Mohammed Abid Khan, who sat huddled in his living room here with his wife and other children.

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