A fighter of Syrian Democratic Forces (SDF) holds her weapon as they announce the destruction of Islamic State's control of land in eastern Syria, at al-Omar oil field in Deir Al Zor, Syria March 23, 2019. REUTERS/Rodi Said TPX IMAGES OF THE DAY

A fighter of Syrian Democratic Forces (SDF) gestures as he sits near ammunition in the village of Baghouz, Deir Al Zor province, Syria March 11, 2019. REUTERS/Rodi Said TPX IMAGES OF THE DAY

A fighter from Syrian Democratic Forces (SDF) stands near civilians, near the village of Baghouz, Deir Al Zor province, Syria February 22, 2019. REUTERS/Rodi Said TPX IMAGES OF THE DAY

Fighters from the Syrian Democratic Forces (SDF) drink tea in the village of Baghouz, Deir Al Zor province, Syria February 18, 2019. REUTERS/Rodi Said TPX IMAGES OF THE DAY

Fighters from the self-defence forces of the Kurdish-led north hold their weapons during a rally in Hasaka, northeastern Syria, January 23, 2018. REUTERS/Rodi Said TPX IMAGES OF THE DAY

Fighters of Syrian Democratic Forces place flags at Naim Square after liberating Raqqa, Syria October 18, 2017. REUTERS/Rodi Said TPX IMAGES OF THE DAY

Fighters of the Syrian Democratic Forces (SDF) dance along a street in Raqqa, Syria October 18, 2017. REUTERS/Erik De Castro TPX IMAGES OF THE DAY

Fighters of Syrian Democratic Forces raise a white flag near the National Hospital complex where the Islamic State militants are holed up, at the frontline in Raqqa, Syria October 16, 2017. REUTERS/Erik De Castro TPX IMAGES OF THE DAY

Syrian Democratic Forces (SDF) fighters ride atop military vehicles as they celebrate victory in Raqqa, Syria, October 17, 2017. REUTERS/Erik De Castro TPX IMAGES OF THE DAY

A member of Syrian Democratic Forces runs for cover from the sniper fire of the Islamic State militants near the stadium in Raqqa, Syria, October 4, 2017. REUTERS/Erik De Castro TPX IMAGES OF THE DAY

A member of the Syrian Democratic Forces who broke his leg during the fighting with Islamic State's fighters reacts while being bandaged by his comrade in the old city of Raqqa, Syria August 19, 2017. REUTERS/Zohra Bensemra TPX IMAGES OF THE DAY

Members of the Syrian Democratic Forces control the monitor of their drone at their advanced position, during the fighting with Islamic State's fighters in Nazlat Shahada, a district of Raqqa, Syria August 16, 2017. REUTERS/Zohra Bensemra TPX IMAGES OF THE DAY

Kurdish fighters from the People's Protection Units (YPG) run across a street in Raqqa, Syria July 3, 2017. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

A Kurdish fighter from the People's Protection Units (YPG) carries ammunition in Raqqa, Syria June 21, 2017. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

A Kurdish fighter from the People's Protection Units (YPG) looks out of a window in Raqqa, Syria June 18, 2017. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

A female Kurdish fighter from the People's Protection Units (YPG) fires a long range sniper rifle at Islamic State militants in Raqqa, Syria June 18, 2017. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

Kurdish fighters from the People's Protection Units (YPG) fires rifles at a drone operated by Islamic State militants in Raqqa, Syria June 16, 2017. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

A Kurdish fighter from the People's Protection Units (YPG) rests in house in Raqqa, Syria June 16, 2017. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

A Kurdish fighter from the People's Protection Units (YPG) fires a 120 mm mortar round in Raqqa, Syria, June 15, 2017. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

Kurdish fighters from the People's Protection Units (YPG) extinguish a fire in a wheat field burned during clashes with Islamic State militants in Raqqa, Syria, June 15, 2017. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

Kurdish fighters from the People's Protection Units (YPG) chat with members of U.S. forces in the town of Darbasiya next to the Turkish border, Syria April 29, 2017. Picture taken April 29, 2017. REUTERS/Rodi Said

Relatives and fighters from the Kurdish People's Protection Units (YPG) gather near the coffins of fellow fighters, who were killed during Turkish airstrikes on the headquarters of the YPG in Mount Karachok on Tuesday, during their funeral in the Syrian Kurdish town of Derik, Syria April 29, 2017. Picture taken April 29, 2017. REUTERS/Rodi Said

Fighters from the Kurdish People's Protection Units (YPG) carry the coffin of a fellow fighter, who was killed with others during Turkish airstrikes on the headquarters of the YPG in Mount Karachok on Tuesday, during her funeral in the Syrian Kurdish town of Derik, Syria April 29, 2017. Picture taken April 29, 2017. REUTERS/Rodi Said TPX IMAGES OF THE DAY

Kurdish fighters from the People's Protection Units (YPG) stand near a U.S military vehicle in the town of Darbasiya next to the Turkish border, Syria April 28, 2017. REUTERS/Rodi Said

Kurdish fighters from the People's Protection Units (YPG) head a convoy of U.S military vehicles in the town of Darbasiya next to the Turkish border, Syria April 28, 2017. REUTERS/Rodi Said

A Kurdish fighter from the People's Protection Units (YPG) gestures at a convoy of U.S military vehicles driving in the town of Darbasiya next to the Turkish border, Syria April 28, 2017. REUTERS/Rodi Said

A helicopter carrying U.S. military officials arrive at the headquarters of the Kurdish fighters from the People's Protection Units (YPG) that was hit by Turkish airstrikes in Mount Karachok near Malikiya, Syria April 25, 2017. REUTERS/Rodi Said

A Kurdish fighter from the People's Protection Units (YPG) takes part during a celebration for the spring festival of Nowruz, in the northeastern Syrian city of Qamishli near the Turkish border, Syria March 21, 2017. REUTERS/Rodi Said

Kurdish fighters from the People's Protection Units (YPG) chat in the Ghwairan neighborhood of Hasaka, Syria, August 22, 2016. A statue of Bassel al-Assad, brother of Syria's President Bashar, is seen in the background. REUTERS/Rodi Said

A Kurdish fighter from the People's Protection Units (YPG) carries his weapon as he walks at the faculty of economics where a defaced picture of Syrian President Bashar al-Assad is seen in the background, in the Ghwairan neighborhood of Hasaka, Syria, August 22, 2016. REUTERS/Rodi Said

A Kurdish fighter from the People's Protection Units (YPG) fires his weapon at a statue of Bassel al-Assad, brother of Syria's President Bashar, in the Ghwairan neighborhood of Hasaka, Syria, August 22, 2016.REUTERS/Rodi Said

Kurdish fighters from the People's Protection Units (YPG) carry their weapons as they take positions in the northeastern city of Hasaka, Syria, August 20, 2016. Picture taken August 20, 2016. REUTERS/Rodi Said TPX IMAGES OF THE DAY

Kurdish fighters from the People's Protection Units (YPG) carry their weapons as they take positions in the northeastern city of Hasaka, Syria, August 20, 2016. Picture taken August 20, 2016. REUTERS/Rodi Said

A Kurdish female fighter from the People's Protection Units (YPG) carries her weapon as she crosses a street towards her position in the southeast of Qamishli city, Syria, April 22, 2016. REUTERS/Rodi Said

A Kurdish People's Protection Units (YPG) fighter walks near graves of fellow fighters during a visit to a YPG graveyard in Qamishli, Syria, March 11, 2016. REUTERS/Rodi Said

A Kurdish People's Protection Units (YPG) fighter drives a vehicle with a sticker of of jailed Kurdish leader Abdullah Ocalan on the windshield in Qamishli, Syria, March 11, 2016. REUTERS/Rodi Said

Kurdish People's Protection Units (YPG) fighters carry their weapons while riding on the back of a pick-up truck in Qamishli, Syria, March 11, 2016. REUTERS/Rodi Said

A Kurdish People's Protection Units (YPG) fighter walks near a wall, which activists said was put up by Turkish authorities, on the Syria-Turkish border in the western countryside of Ras al-Ain, Syria January 29, 2016. REUTERS/Rodi Said

A Kurdish female fighter from the People's Protection Units (YPG) gestures as she carries her weapon near al-Hawl area where fighting between Islamic State fighters and fighters from Democratic Forces of Syria are taking place in south-eastern city of Hasaka, Syria November 10, 2015. Picture taken November 10, 2015. REUTERS/Rodi Said

A Kurdish People's Protection Units (YPG) fighter takes up position inside a damaged building in al-Vilat al-Homor neighborhood in Hasaka city, as he monitors the movements of Islamic State fighters who are stationed in Ghwayran neighborhood in Hasaka city, Syria July 22, 2015. A Syrian Kurdish militia said on Monday it was in near full control of the northeastern city of Hasaka, expanding its sway at the expense of the Damascus government in the wake of an Islamic State attack in the area. Full control of Hasaka - which was split between the Kurds and Damascus until last month - would be a major gain for the autonomous Kurdish administration that is fighting Islamic State in Syria in partnership with Washington. Picture taken July 22, 2015. REUTERS/Rodi Said TPX IMAGES OF THE DAY

Kurdish fighters gesture while carrying their parties' flags in Tel Abyad of Raqqa governorate after they said they took control of the area June 15, 2015. Syrian Kurdish-led forces said they had captured a town at the Turkish border from Islamic State on Monday, driving it away from the frontier in an advance backed by U.S.-led air strikes that has thrust deep into the jihadists' Syria stronghold. The capture of Tel Abyad by the Kurdish YPG and smaller Syrian rebel groups means the Syrian Kurds effectively control some 400 km (250 miles) of the Syrian-Turkish border that has been a conduit for foreign fighters joining Islamic State. Picture taken June 15, 2015. REUTERS/Rodi Said TPX IMAGES OF THE DAY

A Kurdish People's Protection Units (YPG) fighter walks amid debris around damaged silos of Aliya village after saying that they retook control of the area from IS in the southern countryside of Ras al-Ain May 13, 2015. Picture taken May 13, 2015. REUTERS/Rodi Said TPX IMAGES OF THE DAY

Kurdish People's Protection Units (YPG) fighters stand with their weapons in Tel Hamis in Hasaka countryside March 1, 2015. Kurdish forces dealt a blow to Islamic State by capturing Tel Hamis, an important town, on Friday in the latest stage of a powerful offensive in northeast Syria, a Kurdish militia spokesman said. The capture of Tel Hamis was announced by the Kurdish YPG militia and confirmed by the Syrian Observatory for Human Rights, which monitors the country's civil war. REUTERS/Rodi Said (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY)

A fighter of the Kurdish People's Protection Units (YPG) fires an anti-aircraft weapon from Tel Tawil village in the direction of Islamic State fighters positioned in the countryside of the town of Tel Tamr February 25, 2015. Kurdish militia pressed an offensive against Islamic State in northeast Syria on Wednesday, cutting one of its supply lines from Iraq, as fears mounted for dozens of Christians abducted by the hardline group. The Assyrian Christians were taken from villages near the town of Tel Tamr, some 20 km (12 miles) to the northwest of the city of Hasaka. There has been no word on their fate. There have been conflicting reports on where the Christians had been taken. REUTERS/Rodi Said (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY)

Fighters of the Kurdish People's Protection Units (YPG) drive a makeshift armoured vehicle along a street in the northeastern province of al-Hasaka, February 2, 2015. Picture taken February 2, 2015. REUTERS/Rodi Said (SYRIA - Tags: CIVIL UNREST POLITICS CONFLICT TPX IMAGES OF THE DAY)

Fighters of the Kurdish People's Protection Units (YPG) stand on the debris of a damaged building in the northern Syrian town of Kobani January 28, 2015. Kurdish forces battled Islamic State fighters outside Kobani on Tuesday, a monitoring group said, a day after Kurds said they had taken full control of the northern Syrian town following a four-month battle. Known as Ayn al-Arab in Arabic, the mainly Kurdish town close to the Turkish border has become a focal point in the international fight against Islamic State, an al Qaeda offshoot that has spread across Syria and Iraq. REUTERS/Osman Orsal (SYRIA - Tags: POLITICS TPX IMAGES OF THE DAY CONFLICT)

A makeshift armoured vehicle of the Kurdish People's Protection Units (YPG) is parked in the northern Syrian town of Kobani January 28, 2015. Kurdish forces battled Islamic State fighters outside Kobani on Tuesday, a monitoring group said, a day after Kurds said they had taken full control of the northern Syrian town following a four-month battle. Known as Ayn al-Arab in Arabic, the mainly Kurdish town close to the Turkish border has become a focal point in the international fight against Islamic State, an al Qaeda offshoot that has spread across Syria and Iraq. REUTERS/Osman Orsal (SYRIA - Tags: POLITICS CONFLICT TPX IMAGES OF THE DAY)

Kurdish peshmerga fighters wave Kurdish flags atop an army vehicle as they move towards the Syrian town of Kobani from the border town of Suruc, Sanliurfa province, October 31, 2014. A convoy of Iraqi Kurdish peshmerga forces in Turkey headed on Friday towards the Syrian border where they were expected to help push back Islamic State insurgents encircling the mainly Kurdish border town of Kobani, a Reuters witness said. REUTERS/Yannis Behrakis (TURKEY - Tags: MILITARY CONFLICT POLITICS TPX IMAGES OF THE DAY)

People wave to Kurdish Peshmerga fighters on their way to the Syrian town of Kobani, in Dohuk province October 28, 2014. Iraqi peshmerga fighters headed for the Syrian town of Kobani on Tuesday to help fellow Kurds repel an Islamic State advance that has defied U.S.-led air strikes and become an important test of the coalition's ability to combat the Sunni insurgents. Picture taken October 28, 2014. REUTERS/Ari Jalal (IRAQ - Tags: MILITARY)

A convoy of Kurdish peshmerga fighters drive through Arbil after leaving a base in northern Iraq, on their way to the Syrian town of Kobani, October 28, 2014. Iraqi peshmerga fighters left Iraq for the besieged Syrian town of Kobani on Tuesday to help fellow Kurds in their battle against Islamic State militants, a senior Kurdish official said. REUTERS/Azad Lashkari (IRAQ - Tags: CIVIL UNREST MILITARY POLITICS TPX IMAGES OF THE DAY CONFLICT) )

A female Kurdish fighter from the Popular Protection Units (YPG) points her weapon as she takes up a position to guard an area in Aleppo's Sheikh Maqsoud neighborhood, June 19, 2013. Kurdish fighters from the Popular Protection Units (YPG) joined the Free Syrian Army to fight against forces loyal to Syria's President Bashar al-Assad. Picture taken June 19, 2013. REUTERS/Nour Kelze (SYRIA - Tags: POLITICS CIVIL UNREST CONFLICT TPX IMAGES OF THE DAY)

U.S military vehicles and Kurdish fighters from the People's Protection Units (YPG) drive in the town of Darbasiya next to the Turkish border, Syria April 28, 2017. REUTERS/Rodi Said

Kurdish fighters from the People's Protection Units (YPG) head a convoy of U.S military vehicles in the town of Darbasiya next to the Turkish border, Syria April 28, 2017. REUTERS/Rodi Said

A U.S. military commander (R) walks with a commander (C) from the Kurdish People's Protection Units (YPG) as they inspect the damage at YPG headquarters after it was hit by Turkish airstrikes in Mount Karachok near Malikiya, Syria April 25, 2017. REUTERS/Rodi Said TPX IMAGES OF THE DAY