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Residents inspect blood stains after what activists said was shelling by warplanes loyal to Syria's president Bashar Al-Assad on Saad Al-Ansari school in Aleppo's rebel-controlled Al-Mashad neighborhood, April 12, 2015. REUTERS/Abdalrhman Ismail
Girls who survived what activists said was a ground-to-ground missile attack by forces of Syria's President Bashar al-Assad, hold hands at Aleppo's Bab al-Hadeed district, April 7, 2015. REUTERS/Abdalrhman Ismail
Civil defense members put out a fire amid damage in a site hit by what activists said was a barrel bomb dropped by warplanes loyal to Syria's President Bashar al-Assad in Aleppo, April 18, 2015. REUTERS/Hosam Katan
A man reacts carrying a dead child after what activists said were airstrikes by warplanes loyal to Syria's President Bashar al-Assad in Da'el town, north of Daraa, April 19, 2015. REUTERS/Alaa Al-Faqir
A man reacts as he looks for survivors at a site hit by what activists said were barrel bombs dropped by forces of Syria's President Bashar al-Assad, at al-Thawra neighborhood in Idlib city, April 20, 2015. REUTERS/Ammar Abdullah
A woman reacts at a site hit by what activists said were an airstrike by forced loyal to Syria's President Bashar al-Assad in Aleppo, April 17, 2015. REUTERS/Hosam Katan
An injured man walks amid debris as residents reacts at a site hit by what activists said were barrel bombs dropped by forces of Syria's President Bashar al-Assad, at al-Thawra neighborhood in Idlib city, April 20, 2015. REUTERS/Ammar Abdullah
A man inspects the damage from what activists said was due to shelling by warplanes loyal to Syria's president Bashar Al-Assad inside a vegetable market in the al-Maadi neighbourhood of Aleppo, April 11, 2015. REUTERS/Rami Zayat
A general view shows damaged buildings in Aleppo city at night, April 11, 2015. REUTERS/Rami Zayat
Residents wait in line to receive food aid in Yarmouk camp, April 14, 2015. REUTERS/Moayad Zaghmout
A man searches for belongings in a damaged car at a site hit by what activists said were barrel bombs dropped by forces of Syria's President Bashar al-Assad, at al-Thawra neighborhood in Idlib city, April 20, 2015. REUTERS/Ammar Abdullah
A woman holds the hands of a girl who survived what activists said was a surface-to-surface missile attack by forces of Syria's President Bashar al-Assad at Aleppo's Bab al-Hadeed district, April 7, 2015. REUTERS/Abdalrhman Ismail
A boy reacts over his father's dead body as his mother mourns, at a site hit by what activists said were barrel bombs dropped by forces loyal to Syria's President Bashar Al-Assad, in Bab al-Hadid district of Aleppo, April 17, 2015. REUTERS/Abdalrhman Ismail
Children walk beside a painted wall inside Jarmaq school in Yarmouk camp, April 14, 2015. The text on the wall reads in Arabic "It's my right to learn." REUTERS/Moayad Zaghmout
A man walks on rubble at a site hit by what activists said was a barrel bomb dropped by forces loyal to Syria's President Bashar Al-Assad in Qastal Harami in the old city of Aleppo, April 15, 2015. REUTERS/Abdalrhman Ismail
Dead bodies lie on the ground after what activists said were airstrikes by warplanes loyal to Syria's President Bashar al-Assad in Da'el town , north of Daraa, April 19, 2015. REUTERS/Alaa Al-Faqir
A man holds two young girls reacting as they rush out from a site hit by what activists said were barrel bombs dropped by forces of Syria's President Bashar al-Assad, at al-Thawra neighborhood in Idlib city, April 20, 2015. REUTERS/Ammar Abdullah
A man rides a motorcycle at a site hit by what activists said was an airstrike by forces loyal to Syria's President Bashar al-Assad in Idlib city, April 14, 2015. REUTERS/Mohamad Bayoush
Residents help a woman amidst the rubble of her house after her family died at a site hit by what activists said was a barrel bomb dropped by warplanes operated by forces of Syria's President Bashar al-Assad in the Al-Sakhour neighborhood of Aleppo, April 19, 2015. REUTERS/Hosam Katan
Civil defence members carry the body of a girl who was killed after what activists said were barrel bombs dropped by forces loyal to Syria's President Bashar Al-Assad in Aleppo's rebel-controlled al-Maadi district, April 13, 2015. REUTERS/Abdalrhman Ismail
A civil defence member tries to put out a fire inside a damaged building after what activists said was a barrel bomb dropped by forces loyal to Syria's president Bashar Al-Assad in Idlib, after Islamist rebel fighters took control of the area, April 11, 2015. REUTERS/Ammar Abdullah
A man reacts as he sits on rubble of damaged buildings at a site hit by what activists said was an airstrike by forces loyal to Syria's President Bashar al-Assad in Aleppo's al-Fardous district, April 14, 2015. REUTERS/Rami Zayat
Residents wait in line to receive food aid in Yarmouk camp, April 14, 2015. REUTERS/Moayad Zaghmout
Residents inspect the damage from what activists said was due to shelling by warplanes loyal to Syria's president Bashar Al-Assad inside a vegetable market in the al-Maadi neighbourhood of Aleppo, April 11, 2015. REUTERS/Rami Zayat
Residents pack their belongings inside a pick-up truck before fleeing Zabdin village fearing shelling by forces loyal to Syria's president Bashar Al-Assad on the village, Damascus suburb, April 12, 2015. REUTERS/Amer Almohibany
Residents monitor an injured child after what activists said were airstrikes by warplanes loyal to Syria's President Bashar al-Assad in Da'el town, north of Daraa, April 19, 2015. REUTERS/Alaa Al-Faqir
A man removes debris in a site hit by what activists said were barrel bombs dropped by forces of Syria's President Bashar al-Assad, at al-Thawra neighborhood in Idlib city, April 20, 2015. REUTERS/Ammar Abdullah
A woman reacts while civil defence members carry her dead child after what activists said was shelling by warplanes loyal to Syria's president Bashar Al-Assad in Aleppo's rebel-controlled Bab Al-Nairab district, April 12, 2015. REUTERS/Abdalrhman Ismail
A man inspects a damaged site hit by what activists said were an airstrike by forces loyal to Syria's President Bashar al-Assad in Aleppo, April 17, 2015. REUTERS/Hosam Katan
A man gestures as he shouts for gathered people to dismiss after what activists said were an airstrike by forces loyal to Syria's President Bashar al-Assad in the village of Sarmin in Idlib province, April 15, 2015. REUTERS/Mohamad Bayoush