The report draws its evidence from the testimony of a Syrian government defector codenamed "Caesar" and almost 27,000 photographs he provided; in all 55,000 such images were brought out of the country.

According to the report, Caesar worked as photographer in the military police. Once the war broke out, his work consisted entirely of documenting "killed detainees."

He claimed to have photographed as many as 50 bodies a day.

http://www.cnn.com/2014/01/20/world/syria-torture-photos-amanpour/