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More than half of the deaths were never documented due to the difficulty of collecting reliable data on death tolls in conflict zones, made still harder by the brutality of Syria's war.
At least 306,887 civilians were killed in the first decade of Syria's conflict "as a direct result of war operations," the U.N. human rights office estimated.
The number of people killed in Syria is commonly assessed at more than half a million, but the existing data are "convenience samples" and almost certainly an undercount.
