A girl looks out from a door near a poster advertising for a beauty salon in the rebel held Qaboun neighborhood of Damascus, Syria March 13, 2016. The word “sniper” is seen written on the wall. (Photo by Bassam Khabieh/Reuters)





A boy walks past satellites dishes used as planting beds in the rebel held Qaboun neighborhood of Damascus, Syria March 13, 2016. (Photo by Bassam Khabieh/Reuters)





A general view shows damaged buildings as seen from the rebel held Qaboun neighborhood of Damascus, Syria March 13, 2016. (Photo by Bassam Khabieh/Reuters)





Aya, 4, eats bread as she stands in front of a shop in the rebel held Qaboun neighborhood of Damascus, Syria March 13, 2016. (Photo by Bassam Khabieh/Reuters)





Khaled Kassmou, 70, sits along a street in the rebel held Qaboun neighborhood of Damascus, Syria March 13, 2016. (Photo by Bassam Khabieh/Reuters)





A rebel fighter from Jaysh al-Sunna wears a military vest inside a safe house in Mkahaleh village, in the southern countryside of Aleppo, Syria March 14, 2016. (Photo by Khalil Ashawi/Reuters)





Rebel fighters from Jaysh al-Sunna inspect a hole in the ground after an unexploded shell fell in a farmland in Mkahaleh village, in the southern countryside of Aleppo, Syria March 14, 2016. (Photo by Khalil Ashawi/Reuters)





A rebel fighter from Jaysh al-Sunna aims his weapon while searching for a sniper in Mkahaleh village, in the southern countryside of Aleppo, Syria March 14, 2016. (Photo by Khalil Ashawi/Reuters)





Residents walk on the President bridge in Damascus, Syria March 14, 2016. (Photo by Omar Sanadiki/Reuters)





People walk near a Syrian national flag at the President bridge in Damascus, Syria March 14, 2016. (Photo by Omar Sanadiki/Reuters)





A general view is seen from the President bridge in Damascus, Syria March 14, 2016. (Photo by Omar Sanadiki/Reuters)





Children play in the rebel-held Tishreen neighborhood of Damascus, Syria March 14, 2016. (Photo by Bassam Khabieh/Reuters)





A child rests in a cradle along a street in the rebel-held Tishreen neighborhood of Damascus, Syria March 14, 2016. (Photo by Bassam Khabieh/Reuters)





A boy walks past a damaged building in the rebel-held Tishreen neighborhood of Damascus, Syria March 14, 2016. (Photo by Bassam Khabieh/Reuters)





Children play in the rebel-held Tishreen neighborhood of Damascus, Syria March 14, 2016. (Photo by Bassam Khabieh/Reuters)





Boys walk past a damaged bus in the rebel-held Qaboun neighborhood of Damascus, Syria March 14, 2016. (Photo by Bassam Khabieh/Reuters)





Children stand on a rooftop in the rebel-held Tishreen neighborhood of Damascus, Syria March 14, 2016. (Photo by Bassam Khabieh/Reuters)





A girl walks along a street in the rebel-held Tishreen neighborhood of Damascus, Syria March 14, 2016. (Photo by Bassam Khabieh/Reuters)





Children covering themselves with an opposition flag dance as they take part in a protest marking the fifth anniversary of the Syrian crisis in the old city of Aleppo, Syria March 15, 2016. (Photo by Abdalrhman Ismail/Reuters)





Women carry Free Syrian Army flags while attending an anti-government protest in Maarat al-Numan, south of Idlib, Syria March 18, 2016. (Photo by Khalil Ashawi/Reuters)





Women carry Free Syrian Army flags while attending an anti-government protest in Maarat al-Numan, south of Idlib, Syria March 18, 2016. (Photo by Khalil Ashawi/Reuters)





A girl walks near rubble of damaged buildings in the rebel held besieged town of Douma, eastern Damascus suburb of Ghouta, Syria March 19, 2016. (Photo by Bassam Khabieh/Reuters)





Children fill containers with water in the rebel held besieged town of Douma, eastern Damascus suburb of Ghouta, Syria March 19, 2016. (Photo by Bassam Khabieh/Reuters)





Boys play near rubble of damaged buildings in the rebel held besieged town of Douma, eastern Damascus suburb of Ghouta, Syria March 19, 2016. (Photo by Bassam Khabieh/Reuters)





Children play on rubble of damaged buildings in the rebel held besieged town of Douma, eastern Damascus suburb of Ghouta, Syria March 19, 2016. (Photo by Bassam Khabieh/Reuters)





A boy rides a bicycle near rubble of damaged buildings in the rebel held besieged town of Douma, eastern Damascus suburb of Ghouta, Syria March 19, 2016. (Photo by Bassam Khabieh/Reuters)





Boys play near rubble of damaged buildings in the rebel held besieged town of Douma, eastern Damascus suburb of Ghouta, Syria March 19, 2016. (Photo by Bassam Khabieh/Reuters)





A dog with a plastic container stuck in its head walks in the rebel held besieged town of Douma, eastern Damascus suburb of Ghouta, Syria March 19, 2016. (Photo by Bassam Khabieh/Reuters)





A man rides with a sheep on a motorbike in the town of Marat Numan in Idlib province, Syria, Syria March 19, 2016. (Photo by Khalil Ashawi/Reuters)





A man and a boy drive a motorbike while selling ice-cream in the town of Marat Numan in Idlib province, Syria, Syria March 19, 2016. (Photo by Khalil Ashawi/Reuters)





Abu Hatem, 75, reads as he sits outdoor in the rebel held Douma neighborhood of Damascus, Syria March 20, 2016. (Photo by Bassam Khabieh/Reuters)





A man rides on a cart pulled by a horse along a street in the rebel-held Douma neighborhood of Damascus, Syria March 20, 2016. (Photo by Bassam Khabieh/Reuters)





A street vendors sits near his stall in the rebel held Douma neighborhood of Damascus, Syria March 20, 2016. (Photo by Bassam Khabieh/Reuters)





Supporters of the Syrian Social Nationalist party offer traditional arabic sweets to people to celebrate Syrian Mother's Day in the ancient Christian quarter of Bab-Touma in Damascus, Syria March 21, 2016. (Photo by Omar Sanadiki/Reuters)





A girl holds a Syrian national flag as a supporter of the Syrian Social Nationalist party offers traditional arabic sweets to celebrate Syrian Mother's Day in the ancient Christian quarter of Bab-Touma in Damascus, Syria March 21, 2016. (Photo by Omar Sanadiki/Reuters)





Mothers of Kurdish female fighters from the People's Protection Units (YPG) wear traditional dresses as they dance during a gathering to celebrate the spring festival of Newroz in the northeast Syrian Kurdish city of Qamishli, Syria March 21, 2016. (Photo by Rodi Said/Reuters)





A woman wearing traditional dress, dances during a gathering to celebrate the spring festival of Newroz in the northeast Syrian Kurdish city of Qamishli, Syria March 21, 2016. (Photo by Rodi Said/Reuters)





Kurdish female fighters from the People's Protection Units (YPG) and women wearing traditional dresses, dance as they celebrate the spring festival of Newroz in the northeast Syrian Kurdish city of Qamishli, Syria March 21, 2016. (Photo by Rodi Said/Reuters)





A Free Syrian Army fighter plays with a ball in the rebel-controlled area of Jobar, a suburb of Damascus, Syria March 23, 2016. (Photo by Bassam Khabieh/Reuters)





A boy runs near damaged buildings while competing in “Freedom Marathon” marking the fifth anniversary of the Syrian crisis, in the town of Marat Numan in Idlib province, Syria, March 23, 2016. (Photo by Khalil Ashawi/Reuters)





A man sells bread in the town of Marat Numan in Idlib province, Syria March 24, 2016. (Photo by Khalil Ashawi/Reuters)





Residents walk through a vegetable market in the town of Marat Numan in Idlib province, Syria March 24, 2016. (Photo by Khalil Ashawi/Reuters)





A picture made available 23 March 2016 shows Syrian children playing on a street in the Teshreen neighbourhood of Damascus, Syria, 22 March 2016. The area is controlled by forces opposing the Syrian regime. (Photo by Mohammed Badra/EPA)





A fighter belonging to Jaish al-Islam (Islam Army) runs to take cover near the frontline on March 14, 2016 in the neighbourhood of Jobar, on the eastern outskirts of the capital Damascus. (Photo by Amer Almohibany/AFP Photo)





epaselect epa05218569 Syrians commemorate the start of the Syrian war and shout slogans against the Assad government during a protest in Saqba, eastern Al-Ghouta province, outside Damascus, Syria, 18 March 2016. Syrians in the rebel-held areas mark the fifth anniversary of the start of the Syrian uprising that resulted in the death of over a quarter of a million people and displaced millions. (Photo by Mohammed Badra/EPA)





A Syrian boy plays in a vehicle in the al-Qaboun rebel held northeastern suburb of the capital Damascus on March 13, 2016. One in three Syrian children have known nothing but a lifetime of war, UNICEF said, as the country's conflict enters its sixth year this week. Forced from their homes and schools, orphaned by violence and drafted into work or fighting, a generation of Syria's children is being shaped by the conflict, UNICEF said in a new report. (Photo by Abd Doumany/AFP Photo)