
By Rukmini Callimachi
June 29, 2016
When the bodies of Islamic State fighters are recovered on the Syrian battlefield, the passports found on them have often been stamped in Turkey, which thousands of recruits pass through on their way to join the terror group.
Fighters who call relatives abroad often do so using Turkish cellphone numbers, and when they need cash, they head to Western Union offices in southern Turkey, according to court and intelligence documents.
From the start of the Islamic State’s rise through the chaos of the Syrian war, Turkey has played a central, if complicated, role in the group’s story. For years, it served as a rear base, transit hub and shopping bazaar for the Islamic State, and at first, that may have...