A Syrian man carries the body of a child killed in a reported air strike by government forces in the rebel-held area of Douma, east of the capital Damascus, on November 7, 2015. AFP PHOTO / ABD DOUMANY

A man reacts as he looks at the body of his daughter, who was killed following reported air raids by Syrian government forces on August 24, 2015, at a make shift hospital in the rebel-held area of Douma, east of the capital Damascus. AFP PHOTO / ABD DOUMANY

A wounded Syrian girl cries at a make-shift hospital in the rebel-held area of Douma, east of the capital Damascus, following reported air strikes by regime forces, on August 12, 2015. AFP PHOTO / ABD DOUMANY

A wounded Syrian girl looks on at a make shift hospital in the rebel-held area of Douma, east of the capital Damascus, following shelling and air raids by Syrian government forces on August 22, 2015.

An injured Syrian child waits for treatment at a makeshift hospital in the rebel held area of Douma, north east of the capital Damascus, following reported air strikes by forces loyal to President Bashar al-Assad on February 2, 2015. AFP PHOTO / ABD DOUMANY

A wounded Syrian child is treated at a makeshift clinic in the rebel-held area of Douma, east of the capital Damascus, following reported air strikes by government forces in the area of the Central Hospital of Damascus on April 6, 2015. AFP PHOTO / ABD DOUMANY

A wounded Syrian girl hold on to a relative as she awaits treatment by doctors at a makeshift hospital in the rebel-held area of Douma, east of the capital Damascus, following reported air strikes on the city on May 11, 2015. AFP PHOTO / ABD DOUMANY

An injured Syrian boy awaits treatment at a makeshift hospital following reported air strikes by government forces in the rebel-held area of Douma, east of the capital Damascus, on October 29, 2015. Syrian government air strikes on a market and a hospital killed several civilians in Douma, the Syrian Observatory for Human Rights monitor and activists said. AFP PHOTO / ABD DOUMANY

Young injured Syrian boys wait to receive treatment at a make-shift hospital in the rebel-held area of Douma, east of the capital Damascus, following air strikes by Syrian government forces on a marketplace on August 16, 2015. AFP PHOTO / ABD DOUMANY

GRAPHIC CONTENT A wounded Syrian boy sits on the floor next to men receiving treatment at a make-shift hospital in the rebel-held area of Douma, east of the capital Damascus, following reported air strikes by regime forces, on August 12, 2015. AFP PHOTO / ABD DOUMANY

A picture taken on August 16, 2015 shows dead bodies lined-up on the ground following air strikes by Syrian government forces on a marketplace in the rebel-held area of Douma, east of the capital Damascus. At least 70 people were killed and 200 people were injured, with the death toll -most of them civilians- likely to rise as many of the wounded were in serious condition, the Syrian Observatory for Human Rights said. AFP PHOTO / ABD DOUMANY

The corpse of a Syrian child, wrapped in a body bag, lies on the ground for identification following a reported air strike by government forces in the rebel-held area of Douma, east of the capital Damascus, on November 7, 2015. AFP PHOTO / ABD DOUMANY