The Turkish government says Syrians living in Istanbul have until 30 October to return to the province where they are registered. Legally, refugees cannot leave that province without permission, but it's believed one million Syrians live in Istanbul, where they often work in the informal economy.
In June, the Turkish government quietly began arresting Syrians and other nationalities, as well.
Late in August, Hayat Tahrir ash-Sham, the Islamist group that controls Idlib province in Syria, was reporting Turkish busses had driven close to 8,000 Syrians over the border and left them to their fates.
Shona Bhattacharyya and Asma Al Omar report on the extraordinary fate of Zarkaria and Amir, two young men who were deported and who were allowed to come back to Turkey.
Click the 'play' button above to listen to the audio report, or subscribe to our podcast by searching 'RFI international report'.