Turkey-backed Syrian rebel fighters assist their injured fellow fighter near the border town of Tal Abyad, Syria, October 24. REUTERS/Khalil Ashawi 

A Turkey-backed Syrian rebel fighter walks an elderly woman past fellow resting fighters near the border town of Tal Abyad, Syria, October 24. REUTERS/Khalil Ashawi 

Turkey-backed Syrian rebel fighters walk inside a building they use to shelter near the border town of Tal Abyad, Syria, October 24. REUTERS/Khalil Ashawi 

Turkey-backed Syrian rebel fighters drive their military tank near the border town of Tal Abyad, Syria, October 24. REUTERS/Khalil Ashawi 

Turkey-backed Syrian rebel fighters ride in their military tank near the border town of Tal Abyad, Syria, October 24. REUTERS/Khalil Ashawi 

An elderly woman and a child are seen along a deserted street in the town of Ras al-Ain, Syria, October 24. REUTERS/Aboud Hamam 

Russian and Syrian national flags are pictured near the northern Syrian village of Zor Magar, as seen from the Turkish border town of Karkamis, Turkey, October 23. REUTERS/Huseyin Aldemir 

Mourners and fighters of the Syrian Democratic Forces carry the coffins of Kurdish fighters who were killed during clashes in the northeastern Syrian town of Ras al-Ain, during a funeral procession in the town of Qamishli, Syria, October 22. REUTERS/Muhammad Hamed 

A fighter of the Syrian Democratic Forces mourns during the funeral procession of Kurdish fighters who were killed during clashes in the northeastern Syrian town of Ras al-Ain, in the town of Qamishli, Syria, October 22.
REUTERS/Muhammad Hamed 

Displaced Kurdish children, who fled from violence with their family after a Turkish offensive in northeastern Syria, sit in a classroom at a public school used as shelter where they now live, in Hasakah, Syria, October 22.
REUTERS/Muhammad Hamed 

A Turkey-backed Syrian rebel fighter takes a rest near the border town of Tal Abyad, Syria, October 22.
REUTERS/Khalil Ashawi 

A convoy of U.S. vehicles is seen after withdrawing from northern Syria, in Erbil, Iraq, October 21. REUTERS/Azad Lashkari 

Displaced Kurds stuck at a border after a Turkish offensive in northeastern Syria, wait to try cross to the Iraqi side, at the Semalka crossing, next Derik city, Syria, October 21.
REUTERS/Muhammad Hamed 

A picture of a member of the Syrian Kurdish (YPG) militia, who was killed during clashes in Syria, hangs on an ambulance during a funeral in Kirkuk, Iraq, October 21.
REUTERS/Ako Rasheed 

A wounded girl is treated in the town of Tal Abyad, Syria, October 20. REUTERS/Khalil Ashawi 

Turkish soldiers stand in front of the flag-wrapped coffin of their comrade Sefa Findik, who was killed in the military operation in northeast Syria, during a ceremony at the GAP Airport in Sanliurfa, Turkey, October 20. REUTERS/Murad Sezer 

A boy stands in line as people receive aid donated by the Turkish Red Crescent in the border town of Tal Abyad, Syria, October 19. REUTERS/Khalil Ashawi 

An explosion in the Syrian town of Ras al-Ain as seen from the Turkish border town of Ceylanpinar, Sanliurfa province, Turkey, October 17. REUTERS/Stoyan Nenov 

Turkey-backed Syrian rebel fighters stand near underground tunnels said to be made by the Syrian Democratic Forces (SDF) in Tal Abyad, Syria October 17. REUTERS/Mahmoud Hassano 

Turkish army vehicles are moving on a road near the Turkish border town of Ceylanpinar, Sanliurfa province, Turkey, October 18. REUTERS/Stoyan Nenov 

A girl walks near a truck mounted with a weapon in the border town of Tal Abyad, Syria, October 17. REUTERS/Khalil Ashawi 

A Syrian displaced woman, who fled violence after the Turkish offensive against Syria, is seen sitting in a bus after arrival at a refugee camp in Bardarash on the outskirts of Dohuk, Iraq, October 17. REUTERS/Ari Jalal 

Turkey-backed Syrian rebel fighters gesture as they stand at a back of a truck in the border town of Tal Abyad, Syria, October 17. REUTERS/Khalil Ashawi 

A boy stands outside a damaged house on the Turkish-Syrian border in Akcakale, Sanliurfa province, Turkey, October 17. REUTERS/Murad Sezer 

Buses carry Syrian displaced families, who fled violence after the Turkish offensive against Syria, to displacement camps on the outskirts of Dohuk, Iraq, October 17.
REUTERS/Ari Jalal 

A Turkey-backed Syrian rebel fighter stands inside an underground tunnel said to be made by the Syrian Democratic Forces in Tal Abyad, Syria October 17. REUTERS/Mahmoud Hassano 

Turkey-backed Syrian rebel fighters sit together in the border town of Tal Abyad, Syria, October 17. REUTERS/Khalil Ashawi 

A Turkey-backed Syrian rebel fighter looks at a mirror in a tailor shop in the border town of Tal Abyad, Syria, October 17. REUTERS/Khalil Ashawi 

Smoke rises over the Syrian town of Ras al-Ain as seen from the Turkish border town of Ceylanpinar, Sanliurfa province, Turkey, October 17. REUTERS/Stoyan Nenov 

Turkey-backed Syrian rebel fighters drive on a truck to cross into Syria, in the border town of Akcakale in Sanliurfa province, Turkey, October 17. REUTERS/Murad Sezer 

'YPG' (Kurdish People's Protection Units) is written over a wall painting of an Islamic State flag inside a house, in the border town of Tal Abyad, Syria, October 16. REUTERS/Khalil Ashawi 

Smoke rises over the Syrian town of Ras al Ain, as seen from the Turkish border town of Ceylanpinar, in Sanliurfa province, Turkey, October 16. REUTERS/Murad Sezer 

Turkey-backed Syrian rebel fighters gesture as they sit in the back of a truck in the border town of Tal Abyad, Syria, October 16. REUTERS/Khalil Ashawi 

Syrian displaced families, who fled violence after the Turkish offensive against Syria, sit in a bus on their way to camps on the outskirts of Dohuk, Iraq, October 16. REUTERS/Ari Jalal 

Smoke rises over the Syrian town of Ras al Ain, as seen from the Turkish border town of Ceylanpinar, in Sanliurfa province, Turkey, October 16. REUTERS/Murad Sezer 

Syrian displaced families, who fled violence after the Turkish offensive against Syria, arrive at a refugee camp in Bardarash on the outskirts of Dohuk, Iraq October 16. REUTERS/Ari Jalal 

Smoke rises over the Syrian town of Ras al-Ain as seen from the Turkish border town of Ceylanpinar, Sanliurfa province, Turkey, October 15. REUTERS/Stoyan Nenov 

Turkey-backed Syrian rebel fighters give bread to civilians in the border town of Tal Abyad, Syria, October 15.
REUTERS/Khalil Ashawi 

Russian and Syrian national flags flutter on military vehicles near Manbij, Syria, October 15. REUTERS/Omar Sanadiki 

Turkey-backed Syrian rebel fighters burn a Tal Abyad Military Council flag at the border town of Tel Abyad, Syria, October 14. REUTERS/Khalil Ashawi 

Turkey-backed Syrian rebel fighters are seen in action in the village of Yabisa, near the Turkish-Syrian border, Syria, October 13. REUTERS/Khalil Ashawi 

A Turkey-backed Syrian rebel fighter fires a weapon in the town of Tal Abyad, Syria, October 13. REUTERS/Khalil Ashawi 

Smoke rises near the border town of Tel Abyad, Syria, October 12. REUTERS/Khalil Ashawi 

Turkey-backed Syrian rebel fighters ride on a vehicle at the border town of Tel Abyad, Syria, October 14.
REUTERS/Khalil Ashawi 

Turkey-backed Syrian rebel fighters walk together near the border town of Tel Abyad, Syria, October 12. REUTERS/Khalil Ashawi 

Turkish-backed Syrian rebels ride on a truck near the Turkish-Syrian border gate as seen from Akcakale, in Sanliurfa province, Turkey, October 13. REUTERS/Murad Sezer 

Turkey-backed Syrian rebel fighters sit together in the village of Yabisa, near the Turkish-Syrian border, Syria, October 13.
REUTERS/Khalil Ashawi 

A Turkey-backed Syrian rebel fighter is seen in the town of Tal Abyad, Syria, October 13. REUTERS/Khalil Ashawi 

A Turkey-backed Syrian rebel fighter holds the Syrian opposition flag in the border town of Akcakale in Sanliurfa province, Turkey, October 11. REUTERS/Khalil Ashawi 

A woman stands in front of an apartment building which was damaged by a rocket fired from Syria, in Nusaybin, Turkey, October 10, 2019. REUTERS/Sertac Kayar 

A Turkey-backed Syrian rebel fighter walks as he holds a bag and a weapon in the border town of Akcakale in Sanliurfa province, Turkey, October 11, 2019. REUTERS/Khalil Ashawi 

Smoke rises over the Syrian town of Ras al-Ain, as seen from the Turkish border town of Ceylanpinar, Sanliurfa province, Turkey, October 11. REUTERS/Kemal Aslan 

A Turkey-backed Syrian rebel fighter holds a flag in the border town of Akcakale in Sanliurfa province, Turkey, October 11, 2019. REUTERS/Khalil Ashawi 

A woman is comforted by her neighboors after a rocket fired from Syria landed in their street in Nusaybin, Turkey, October 11. REUTERS/Sertac Kayar 

Members of the Syrian National Army, known as the Free Syrian Army, react as they drive on top of an armored vehicle in the Turkish border town of Ceylanpinar in Sanliurfa province, Turkey, October 11. REUTERS/Murad Sezer 

Smoke rises over the Syrian town of Tel Abyad, as seen from the Turkish border town of Akcakale in Sanliurfa province, Turkey, October 10. REUTERS/Murad Sezer 

People wave as Turkish military vehicles pass by them in the Turkish border town of Akcakale in Sanliurfa province, Turkey, October 11. REUTERS/Murad Sezer 

A boy stands in a damaged kitchen in the town of Akcakale in Sanliurfa province, Turkey, October 11. REUTERS/Khalil Ashawi 

Turkish military vehicles are seen in the Turkish border town of Ceylanpinar in Sanliurfa province, Turkey, October 11. REUTERS/Murad Sezer 

Vehicles are seen as people flee Ras al Ain town, Syria, October 9. REUTERS/Rodi Said