Tajammu Al-Ezza brigade fighters react while firing a Grad shell towards forces of Syria's President Bashar Al-Assad stationed in Salhab village, Hama countryside, May 7, 2015. (Photo by Mohamad Bayoush/Reuters)





Tajammu Al-Ezza brigade fighters prepare Grad shells before firing them towards forces of Syria's President Bashar Al-Assad stationed at Salhab village, in the Hama countryside May 7, 2015. (Photo by Mohamad Bayoush/Reuters)





A rebel fighter of 'Al-Sultan Murad' brigade fires an anti-tank missile towards forces loyal to Syria's President Bashar al-Assad near Aleppo's international airport May 9, 2015. (Photo by Rami Zayat/Reuters)





A Free Syrian Army fighter carries ammunition on Nahlaya Front in Idlib, during preparations for an operation to take over Ariha city May 9, 2015. (Photo by Khalil Ashawi/Reuters)





A locally made shell is fired by Tajammu Al-Ezza brigade fighters towards forces loyal to Syria's President Bashar Al-Assad stationed at Al-Zlakiet checkpoint, in the Hama countryside May 9, 2015. (Photo by Mohamad Bayoush/Reuters)





A Tajammu Al-Ezza brigade fighter prepares locally made shells before firing them towards forces loyal to Syria's President Bashar Al-Assad stationed at Al-Zlakiet checkpoint, in the Hama countryside May 9, 2015. (Photo by Mohamad Bayoush/Reuters)





A Tajammu Al-Ezza brigade fighter rests beside a locally made weapon before using it to fire towards forces loyal to Syria's President Bashar Al-Assad stationed at Al-Zlakiet checkpoint, in the Hama countryside May 9, 2015. (Photo by Mohamad Bayoush/Reuters)





The body of a fighter loyal to Syria's President Bashar Al-Assad is pictured on the ground after he was killed in clashes with Jaysh al-Islam (Army of Islam) rebel fighters at the Tal-Kurdi frontline in the Eastern Ghouta of Damascus May 10, 2015. (Photo by Amer Almohibany/Reuters)





Jaysh al-Islam (Army of Islam) rebel fighters look out from a tunnel at the Tal-Kurdi frontline in the Eastern Ghouta of Damascus May 10, 2015. (Photo by Amer Almohibany/Reuters)





A Jaysh al-Islam (Army of Islam) rebel fighter fires his weapon towards forces loyal to Syria's President Bashar Al-Assad at the Tal-Kurdi frontline in the Eastern Ghouta of Damascus, May 10, 2015. (Photo by Amer Almohibany/Reuters)





A Jaysh al-Islam (Army of Islam) rebel fighter fires his weapon towards forces loyal to Syria's President Bashar Al-Assad at the Tal-Kurdi frontline in the Eastern Ghouta of Damascus, May 10, 2015. (Photo by Amer Almohibany/Reuters)





A rebel fighter of Jaysh al-Islam (Army of Islam) fires his weapon in Deir Salman frontline, near the highway of Damascus international airport, after what the rebels said were advances they made in the area following clashes with forces loyal to Syria's President Bashar al-Assad May 11, 2015. (Photo by Amer Almohibany/Reuters)





Residents, with their belongings, return to their villages on a pickup truck after Kurdish People's Protection Units (YPG) fighters said that they retook control of the area from Islamic State in the southern countryside of Ras al-Ain May 13, 2015. (Photo by Rodi Said/Reuters)





A boy carries boxes as he walks along a garbage filled area in Jisr al-Hajj in Aleppo May 14, 2015. (Photo by Hosam Katan/Reuters)





Students wait to cross into the government controlled area of Damascus through a checkpoint controlled by forces loyal to Syria's President Bashar al-Assad in the southern Damascus suburb of Babila May 14, 2015. (Photo by Ward Al-Keswani/Reuters)





A man workouts in a gym, frequented by both residents and rebel fighters, in Aleppo's al-Fardous district May 18, 2015. Picture taken May 18, 2015. (Photo by Hosam Katan/Reuters)





A man workouts in a gym, frequented by both residents and rebel fighters, in Aleppo's al-Fardous district May 18, 2015. (Photo by Hosam Katan/Reuters)





Children carry buckets as they queue to receive free meals from a soup kitchen in the besieged town of Deir al-Asafir in the Eastern Ghouta of Damascus May 19, 2015. (Photo by Amer Almohibany/Reuters)





Men serve residents free meals from a soup kitchen in the besieged town of Deir al-Asafir in the Eastern Ghouta of Damascus May 19, 2015. (Photo by Amer Almohibany/Reuters)





Children carry containers as they queue to receive free meals from a soup kitchen in the besieged town of Deir al-Asafir in the Eastern Ghouta of Damascus May 19, 2015. (Photo by Amer Almohibany/Reuters)





A damaged tank is pictured in the Mastouma military base after the rebel fighters seized it, in Idlib May 20, 2015. (Photo by Ammar Abdullah/Reuters)





Residents gesture while carrying their belongings as they head back to their homes after Kurdish People's Protection Units (YPG) said they took control of Abd al-Aziz mountain, Hasaka province May 20, 2015. (Photo by Rodi Said/Reuters)





A Free Syrian Army fighter covers his ears as he fires a round towards forces loyal to Syria's President Bashar al-Assad in Izra'a in Deraa countryside May 21, 2015. (Photo by Alaa Al-Faqir/Reuters)





Free Syrian Army fighters prepare a rocket launcher prior to firing it towards forces loyal to Syria's President Bashar al-Assad in Izra'a in Deraa countryside May 21, 2015. (Photo by Alaa Al-Faqir/Reuters)





Armed Kurdish fighters from People's Protection Units (YPG) are seen in Tel al-Aghbish village, after the YPG said they retook control of the area from the Islamic State, May 21, 2015. (Photo by Rodi Said/Reuters)





Kurdish female fighters from the People's Protection Units (YPG) weave together ribbons, bearing the colours of the YPG flag, in the Assyrian village of Tel Nasri, western of Tel Tamr town, after they said they retook control of the area from the Islamic State, May 21, 2015. (Photo by Rodi Said/Reuters)





Fighters from an alliance of insurgents known as the “Army of Fatah” (Islamic Conquest) carry their weapons as they stand along a street in the village of al-Ziyara, after they took control of it from forces loyal to Syria's President Bashar al-Assad, in Hama province, Syria August 10, 2015. (Photo by Ammar Abdullah/Reuters)





Fighters from an alliance of insurgents known as the “Army of Fatah” (Islamic Conquest) work on a tank that belonged to forces loyal to Syria's President Bashar al-Assad in the village of al-Ziyara, after they took control of the village, in Hama province, Syria August 10, 2015. (Photo by Ammar Abdullah/Reuters)





Men ride their motorbikes past sand barricades after fighters from an alliance of insurgents known as the “Army of Fatah” (Islamic Conquest) took control of al-Ziyara village from forces loyal to Syria's President Bashar al-Assad, in Hama province, Syria August 10, 2015. (Photo by Ammar Abdullah/Reuters)





Fighters from an alliance of insurgents known as the “Army of Fatah” (Islamic Conquest) stand on tanks that belonged to forces loyal to Syria's President Bashar al-Assad in the village of al-Ziyara, after they took control of the village, in Hama province, Syria August 10, 2015. (Photo by Ammar Abdullah/Reuters)





A woman walks with schoolchildren along a street in the old city of Aleppo, Syria August 24, 2015. (Photo by Abdalrhman Ismail/Reuters)





Men drive pick-up trucks past damaged buildings as they transport furniture in the old city of Aleppo, Syria August 24, 2015. (Photo by Abdalrhman Ismail/Reuters)





A boy rides a bicycle near a Free Syrian Army fighter standing along a street, with damaged buses positioned atop buildings to serve as barricades to provide greater protection from snipers of the forces of Syria's President Bashar al-Assad, in the old city of Aleppo, Syria August 24, 2015. (Photo by Abdalrhman Ismail/Reuters)





A boy rides a bicycle past damaged buildings along a street in a rebel-controlled area of Aleppo, Syria, August 30, 2015. (Photo by Abdalrhman Ismail/Reuters)





Boys carry ropes for sale along a street in a rebel-controlled area of Aleppo, Syria, August 30, 2015. (Photo by Abdalrhman Ismail/Reuters)





Free Syrian Army fighters carry their weapons as they walk along a street in a rebel-controlled area of Aleppo, Syria, August 30, 2015. (Photo by Abdalrhman Ismail/Reuters)





Free Syrian Army fighters on a motorbike chat with their friend in a rebel-controlled area of Aleppo, Syria, August 30, 2015. (Photo by Abdalrhman Ismail/Reuters)





A view shows a cemetery as Aleppo's ancient citadel is pictured in the background as seen from a rebel-controlled area of Aleppo, Syria, August 30, 2015. (Photo by Abdalrhman Ismail/Reuters)





Free Syrian Army fighters inspect a pick-up truck with a weapon installed on it as they carry their weapons while they gather in what they said was an operation to travel to the northern countryside of Aleppo to fight Islamic State fighters in Aleppo, Syria, September 3, 2015. (Photo by Abdalrhman Ismail/Reuters)





Free Syrian Army fighters rest with their weapons while they gather in what they said was an operation to travel to the northern countryside of Aleppo to fight Islamic State fighters in Aleppo, Syria, September 3, 2015. (Photo by Abdalrhman Ismail/Reuters)





A vendor sells mint leaves in Al-Shaar nighbourhood of Aleppo, Syria September 7, 2015. (Photo by Abdalrhman Ismail/Reuters)





A vegetables vendor arranges produce in Al-Shaar neighborhood of Aleppo, Syria September 7, 2015. (Photo by Abdalrhman Ismail/Reuters)





Gold jewelry is displayed for sale in Al-Shaar neighborhood of Aleppo, Syria September 7, 2015. (Photo by Abdalrhman Ismail/Reuters)





A boy rides his bicycle in Al-Shaar nighbourhood of Aleppo, Syria September 7, 2015. (Photo by Abdalrhman Ismail/Reuters)





A boy attends a class inside a school in the southern countryside of Idlib, Syria September 20, 2015. (Photo by Khalil Ashawi/Reuters)





A girl shows her notebook to a teacher inside a school in southern countryside of Idlib September 20, 2015. (Photo by Khalil Ashawi/Reuters)





Girls attend a class inside a school in the southern countryside of Idlib, Syria September 20, 2015. (Photo by Khalil Ashawi/Reuters)





A girl draws on a blackboard inside a school in the southern countryside of Idlib, Syria September 20, 2015. (Photo by Khalil Ashawi/Reuters)





Residents inspect a damaged site after what activists said was an airstrike by forces loyal to Syria's President Bashar al-Assad in Maarat Al-Nouman, south of Idlib, September 20, 2015. (Photo by Khalil Ashawi/Reuters)





A boy looks at stuffed toys displayed amid clothes for sale ahead of the Muslim festival of Eid-al-Adha in Aleppo, Syria September 23, 2015. (Photo by Hamid Khatib/Reuters)