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Open Image ModalCivil Defence members put out a fire that spread in an oil refinery in the town of Marat Numan in Idlib province, Syria March 10, 2016. (credit:Khalil Ashawi / Reuters)
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Open Image ModalMembers of pro-government forces stand in front of a destroyed building in Salma, a town in Latakia province, on Jan. 15, 2016. (credit:YOUSSEF KARWASHAN/AFP/Getty Images)
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Open Image ModalSyrian security forces and residents gather near Sayyida Zeinab, a Shia Muslim shrine in Damascus, following a suicide bombing on Jan. 31, 2016. (credit:LOUAI BESHARA/AFP/Getty Images)
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Open Image ModalCivil defense team members try to clear the debris of a building after a Russian airstrike on Anadan, a city in the Aleppo Governate, on Feb. 2, 2016. (credit:Anadolu Agency via Getty Images)
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Open Image ModalPeople search through the debris of collapsed buildings following a Russian airstrike on in Atarib, a district in the Aleppo Governate, on Jan. 31, 2016. (credit:Ahmed Hasan Ubeyd/Anadolu Agency/Getty Images)
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Open Image ModalSmoke rises in Anadan following Russian air strikes on Feb. 2, 2016. (credit:Muhammed Kurab/Anadolu Agency/Getty Images)
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Open Image ModalMembers of Syria's Civil Defense search for people who may have been buried under the wreckage following Russian airstrikes on Aleppo on Feb. 2, 2016. (credit:Muhammed Kurab/Anadolu Agency/Getty Images)
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Open Image ModalPeople search through the wreckage of collapsed buildings following Russian airstrikes in Aleppo on Jan. 31, 2016. (credit:Ahmed Hasan Ubeyd/Anadolu Agency/Getty Images)
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Open Image ModalCivil defense team members clear the debris of a building following airstrikes on residential areas in Anadan on Feb. 2, 2016. (credit:Beha El-Halebi/Anadolu Agency/Getty Images)
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Open Image ModalChildren carry Islamist flags as they pose with a man for photos during an anti-government protest in the rebel-controlled city of Idlib, Syria March 25, 2016. (credit:Ammar Abdullah / Reuters)
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Open Image ModalA boy runs near damaged buildings in the town of Marat Numan in Idlib province, Syria, March 23, 2016. (credit:Khalil Ashawi / Reuters)
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Open Image ModalBoys play near rubble of damaged buildings in the rebel-held besieged town of Douma, eastern Damascus suburb of Ghouta, Syria March 19, 2016. (credit:Bassam Khabieh / Reuters)
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Open Image ModalA damaged building is pictured in the rebel-controlled area of Jobar, a suburb of Damascus, Syria March 23, 2016. (credit:Bassam Khabieh / Reuters)
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Open Image ModalA member of forces loyal to Syria's President Bashar al-Assad takes a position inside a palace complex on March 24, 2016. (credit:Sana Sana / Reuters)
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Open Image ModalResidents take part in an anti-government protest against Syria's President Bashar al-Assad in the town of Marat Numan in Idlib province, Syria March 24, 2016. (credit:Khalil Ashawi / Reuters)
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Open Image ModalA girl walks near rubble of damaged buildings in the rebel held besieged town of Douma, eastern Damascus suburb of Ghouta, Syria March 19, 2016. (credit:Bassam Khabieh / Reuters)
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Open Image ModalRebel fighters from Jaysh al-Sunna stand in Tel Mamo village, in the southern countryside of Aleppo, Syria March 13, 2016. (credit:Khalil Ashawi / Reuters)
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Open Image ModalA general view shows damaged buildings as seen from the rebel held Qaboun neighborhood of Damascus, Syria March 13, 2016. Picture taken March 13, 2016. (credit:Bassam Khabieh / Reuters)
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Open Image ModalKurdish 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. (credit:Rodi Said / Reuters)
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Open Image ModalA man reacts for the loss of family members after an air strike on the rebel held al-Saliheen district in Aleppo, Syria, March 11, 2016. (credit:Abdalrhman Ismail / Reuters)
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Open Image ModalA boy inspects a damaged house in the rebel held besieged city of Douma, a suburb of Damascus, Syria February 27, 2016. (credit:Bassam Khabieh / Reuters)
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Open Image ModalA boy plays with a dog in the rebel-controlled area of Jobar, a suburb of Damascus, Syria March 3, 2016. (credit:Bassam Khabieh / Reuters)
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Open Image ModalProtesters carry Free Syrian Army flags and chant slogans during an anti-government protest in the town of Marat Numan in Idlib province, Syria March 4, 2016. (credit:Khalil Ashawi / Reuters)
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Open Image ModalA broken frame with a picture lies on the ground of a damaged house in the rebel-controlled area of Jobar, a suburb of Damascus, Syria March 3, 2016. (credit:Bassam Khabieh / Reuters)
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Open Image ModalSyria Democratic Forces fighters carry their weapons in a village on the outskirts of al-Shadadi town, Hasaka countryside, Syria February 19, 2016. (credit:Rodi Said / Reuters)
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Open Image ModalA woman inspects damage at a camp for internally displaced people after it was hit by shelling in Jabal al-Turkman, Latakia province January 31, 2016. (credit:Ammar Abdullah / Reuters)
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Open Image ModalA boy reacts in a site hit by what activists said were airstrikes carried out by the Russian air force in the town of Douma, eastern Ghouta in Damascus, Syria January 10, 2016. (credit:Bassam Khabieh / Reuters)
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Open Image ModalWomen mourn the death of a relative killed by Islamic State fighter in Mteahh village near al-Shadadi town, Hasaka countryside Syria February 18, 2016. (credit:Rodi Said / Reuters)
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Open Image ModalA damaged building is seen in Hraytan city, Northern Aleppo countryside, Syria February 3, 2016. (credit:Abdalrhman Ismail / Reuters)
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Open Image ModalA member of the Free Syrian Army rests on a metal top of an underground tunnel in Aleppo, Syria August 3, 2015. (credit:Abdalrhman Ismail / Reuters)