FILE PHOTO: A Free Syrian Army fighter mourns at the grave of his father who was killed by what activists said was shelling by forces loyal to Syria's President Bashar al-Assad, in a public park that has been converted into a makeshift graveyard in Deir el-Zor, Syria March 11, 2013. REUTERS/Khalil Ashawi/File Photo
A Syrian rebel fighter mourns at the grave of his father who was killed in shelling by government forces in Deir Ezzor in March 2013. Reuters

Syrian war toll mounts as conflict enters ninth year